When light is refracted it changes direction due to the change in density as it moves from air into glass or plastic. The image produced is smaller due to the fact that the objects distance from the lens is over two times the lens focal length. Power point uses slides from resources on tes and the worksheets are from btec collins resources. Where rays hitting the lens parallel to the axis all meet. Name each type of lens and complete the three light rays passing through each lens. Light from an object passes through the cornea which is a transparent dome like structure covering the iris.
Most of the lenses we use in everyday life are designed to bend light rays to a specific focal point where items will be in focus clear. The word comes from the latin name for the lentil plant as the lentils themselves have a similar shape to the biconvex pieces of glass that were used at the time for magnifying things. Convex lens converging concave lens diverging convex lenses are thick in the middle and thinner at the edges. They are the basis of all optical instruments, including the eye. A useful revision guide to converging and diverging lenses, such as magnifying glasses, for gcse physics.
They come together at a point called the principal focus. Note that a converging lens has a thicker waist, whereas a diverging lens has a thinner waist. What is a lens a lens is a transparent curved device that is used to refract light a lens is usually made from glass. The distance between the middle of the lens and its focal point.
Converging and diverging lenses lenses edexcel gcse. Gcse physics question paper unit 03 revision science. If the object and image are the same distance from the mirror and magnification is 1, then as the object approaches the mirror at a certain speed, the image is approaching the plane mirror at the same speed, therefore you approach the image more quickly than you approach. In the case of sound waves in air for example, the perturbed quantity is the pressure, which oscillates about the mean atmospheric pressure. A lens is simply a piece of transparent material such as glass, plastic or liquid with one or more curved faces, and the effect that it has on a beam of light depends on the extent and nature of this curvature. Physics single science physics is the study of energy, forces, mechanics, waves, and the structure of atoms and the physical universe. As light from an object refracts as it passes througha a converging or diverging lenses it bends, allowing up to see images. The general study of the relationships between motion, forces, and energy is called mechanics. It causes parallel rays of light to converge move together to a focus. Learn about and revise lenses and their power, real and virtual images, and ray diagrams with gcse bitesize physics. Sample of a revision docuement for aqa gcse physics triple paper 2.
When the word lens was first used, it was defined as a piece of glass to regulate light rays. There are two types of the lenses which are the convex lens and the concave lens. The five important types of tens are shown in figure 1. The greater the power a pair of eyeglasses or contact lenses has, the worse is the vision of the person prescribed them. Ppt on refraction and lenses by pg linkedin slideshare. At gcse you will learn more about atoms, their structures and radiation. The lens is transparent piece of glass or plastic which has a curved surface. A convex lens is thicker at the centre than at the edges. Jul 12, 2019 there are two main types of lenses, known as convex or converging and concave or diverging. Physics is the study of the basic principles that govern the physical world around us. You can go here to learn more about the refraction of light. The concave lens is thin at its center and more thick at the tips, it separates the light rays, so, it is called the diverging lens special concepts related to the lenses.
Queer theory includes both queer readings of texts and the theorization of queerness itself. Focal length is the distance from the lens to its focal point. A convex lens is also called a converging lens because it makes parallel light rays passing. Which row of the table describes the images produced by a converging lens. The light rays are refracted by the cornea onto the lens. Mechanics can be divided into subdisciplines by combining and recombining its different aspects.
Optical microscopes are the oldest design of microscope and were possibly invented in their present compound form in the 17th century. The image distance for a plane mirror is always equal to the object distance because the magnification is 1. Lenses are a crucial part of our modern lives, they allow us to correct peoples vision, view the stars and examine bacteria. Gcse light revise lenses and how they magnify or focus. A convex lens produces an image 35mm tall when a 5mm tall object is viewed. A guide to support non specialists with the lenses aspects of the new edexcel gcse. When a force acts on an object and causes it to move through a distance, energy is transferred and work is done. Resources to look at parts of a camera and the types of lenses used in a camera. Apr 20, 2015 resources to look at parts of a camera and the types of lenses used in a camera. This gcse physics quiz on light takes a second look at lenses. Sample of a revision docuement for aqa gcse physics triple paper full document available at the link above revision documents for each section of aqa gcse physics paper 2 triple includes. How students are looking after their mental health in lockdown.
Focal length the length between the middle of the lens and the point at which it would focus parallel rays of light. A type of poststructuralist critical theory that emerged in the early 1990s out of the fields of queer studies and womens studies. Types of lens lenses ccea gcse physics single science. The course should teach candidates how to make measurements using many different types of instruments. A more specialized form of lenses, spectacles appeared around the 12 th century, but it took until contemporaries of galileo and later newton to develop a decent telescope we should all like lenses. Gcseigcse physics solutions, examples, worksheets, videos. A lens can be converging convex or diverging concave. The best book for both teachers and students to learn physics exactly like in the good old days. It is a large field and its study is essential to the understanding of physics, which is why these chapters appear first. That means we have been playing with lenses for a long time. An introduction to lenses this short video covers some of the terminology you need to know when learning about lenses over the next few videos.
Optics types of lenses, uses and ray diagrams explained. These two types of lenses a double convex and a double concave lens will be the only types of lenses that will be discussed in this unit of the physics classroom tutorial. Lenses are made from materials such as glass or plastic, and are ground and polished or molded to a. Other types of lenses another way to classify lenses is by the curve of the glass on each side of the lens. A case 1 image is formed when do f and f is positive, as in figure 10a.
Aqa gcse 91 physics 8463 past exam papers and marking schemes, the past papers are free to download for you to use as practice for your exams. The lentil plant also gives its name to a geometric figure some scholars argue that the archeological evidence indicates that there was widespread use of lenses in antiquity, spanning several millennia. This gcse physics quiz about light looks at lenses. Diverging lenses, like those worn by people with myopia or nearsightedness, have negative refracting powers. They form as image on the film by using a converging lens. Then, well learn about forces, momentum, energy, and other concepts in lots of different physical situations. They are called convex and concave what is a convex lens a convex lens is thicker in the middle and thinner at the edges.
Suitable for gcseigcse physicsscience courses or their. Converging lenses, like those normally found in reading glasses, have positive refracting powers. Gcse physics mathematics occams razor book drawing math books brain waves sound waves science nature history following recent breakthroughs, researchers are laying the groundwork for a perfect lens that can resolve subwavelength features in real time, as well as a suite of other optical instruments long thought impossible. Find out more about resource plus, a collection of additional teaching and learning resources which have recently been launched to support the delivery of key topics and skills in cambridge igcse physics. I am a pgce student and always looking for feedback. A longsighted person can read writing on a whiteboard in a classroom clearly but cannot read print in a book or newspaper sharply. Search the worlds most comprehensive index of fulltext books. Waves equations and definitions gcse gorillaphysics gcse. The word lens comes from lens, the latin name of the lentil, because a doubleconvex lens is lentilshaped. Refractionrefraction is based on the idea that light is passing through one medium into another it will bend towards or away the normal and this phenomenon is called refraction of light. The text is designed for upperlevel undergraduate students with a physics background. Gcse 91 physics extra papers, questions and answers.
Short sight rays of light focus in front of the retina, can be corrected with concave lenses. A more specialized form of lenses, spectacles appeared around the 12 th century, but it took until contemporaries of galileo and later newton to develop a decent telescope. Theres a lot of stuff to learn with physics and its not all straightforward. The lesson goes over how to draw ray diagrams for convex lenses and covers an experiment to measure the focal length of lenses. Originally used for applied science but the worksheet and sections of the presentation can be used for gcse. When parallel rays of light pass through a convex lens the refracted rays converge at one point called the principal focus. What type of image do concave lenses always produce.
Apr 11, 2019 depending on your school the specific physics curriculum at gcse and a level you follow can vary, but the core topics remain much the same. Real images, such as the one considered in the previous example, are formed by converging lenses whenever an object is farther from the lens than its focal length. Home gcse study tools physics further physics observing the universe lenses and telescopes quiz further physics observing the universe lenses and telescopes quiz a quiz on some of the content from the p7 module. Ancient egyptians, babylonians, and greeks, all had a sense of basic optics. Sep 24, 2015 the lenses are used in microscopes which are used for formation magnified images of the tiny bodies that can not be seen with the naked eye and they are used in making of medical glasses to treat the vision defects. Rotate to landscape screen format on a mobile phone or small tablet to use the mathway widget, a free math problem solver that answers your questions with stepby. Working models of telescopes, microscopes, photographic lenses, and optical projection systems are diagrammed and explained in full, as are the basic experiments for determining accuracy, power, angular field of view, amount of aberration, and all other necessary facts about the instrument. Lenses are used in cameras, telescopes, binoculars, microscopes and corrective glasses. Learn vocabulary, terms, and more with flashcards, games, and other study tools. A convex lens is thicker in the middle than it is at the edges. Jun 14, 2010 this is a sample from our gcse physics revision podcasts. Types of lens when light is refracted it changes direction due to the change in density as it moves from air into glass or plastic.
Gcse physics enjoyable revision with education quizzes. The main development of the book begins in chapter 1 with. Gcse 91 revision guides and exam practice books from scholastic are written by experts and fully matched to the gcse 91 specifications. Magnification lenses aqa gcse physics single science. A lens is a transparent curved device that is used to refract light. Mirrors and lenses a man stands ten meters away from a converging mirror with a focal length of two meters. This is true for movie projectors, cameras, and the eye. A lens is a shaped piece of transparent glass or plastic that refracts light. We explore what is meant by a convex lens and then we look at how to draw ray diagrams to show the. You will no doubt know someone who wears lenses, or you may even wear them yourself if you own a pair of spectacles. A simple lens consists of a single piece of transparent material, while a compound lens consists of several simple lenses elements, usually arranged along a common axis. The classification of a lens depends on how the light rays bend when they pass through the lens. Learn about and revise lenses, images, magnification and absorption, refraction and transmission of light with gcse bitesize physics. The podcasts can be downloaded to your pc or mp3 player for only 59p each, meaning you can revise o.
Experiments involve deciding what type od lenses pupils are given and calculating focal length. All the topics considered in the gcse physics syllabus the. The two main lens types are converging lenses and diverging lenses. Scroll down the page for lessons and examples for the following topics. This book illustrates basic practical applications of optical principle. A convex lens is a converging lens when parallel rays of light pass through a convex lens the refracted rays converge at one point called the principal focus the distance between the principal focus and the centre of the lens is called the focal length. A series of free gcseigcse physics notes and lessons with examples and solutions. Rays of light that pass through the lens are brought closer together they converge. They should see the instruments, handle them, discuss their scales and the scale units before using the instruments. Forces magnetism and electromagnetism black body radiation lenses newtons. Lenses in optics applications types of lenses physics. Lenses are used in cameras, telescopes, binoculars, microscopes.
Depending on your school the specific physics curriculum at gcse and a level you follow can vary, but the core topics remain much the same physics is, among many other topics, the study of energy, mechanics, atoms, space and of the physical environment. Queer theory builds both upon feminist challenges to the idea that gender is part of the essential self and upon gay. In a ray diagram, a convex lens is drawn as a vertical line with outward facing arrows to indicate the shape of the lens. Short sight a shortsighted person can see close objects clearly they have good short sight, but they cant see distant objects clearly. In the next section, let us discuss the different types of lenses. Covering the main exam boards, revision is made easy for students with a free onthego app, practice questions and stepbystep support. Convex and concave lenses lenses aqa gcse physics single. If an object is far away then the distance between the film and the lens needs to be the same as the focal length of the lens. Image formation by lenses physics simple book production. The axis of a lens is a line passing through the middle of the lens. Gcse physics mathematics occams razor book drawing math books brain waves sound waves science nature history physicists pursue the perfect lens by bending light the wrong way following recent breakthroughs, researchers are laying the groundwork for a perfect lens that can resolve subwavelength features in real time, as well as a suite.
Gcse science physics 91 triple concave lenses youtube. The types and uses of lenses in our life science online. Types of lenses there are different ways to classify lenses. Ray diagram for an object that is a long way from a. Both types of lens can be used to form sharp images of a point object placed on one side of them. Gcse science physics 91 triple convex lenses youtube. The diagram below shows the cross section of a human eye. Eyeglasses today are fashion accessories, as stylish as purses and belts. A real image is where the light comes together to form an image on a screen. See more ideas about gcse physics, gcse physics revision and physics revision. Isaac physics a project designed to offer support and activities in physics problem solving to teachers and students from gcse level through to university. Luckily, we have a way for you to learn all the core national curriculum stuff for gcse physics in a way that wont send you to sleep or make you wish you were a cyborg on another planet who didnt have to deal with exams.
A convex lens is thicker in the middle and thinner at the edges. The author, an assistant professor at the imperial college of science and technology in london, shows how to set up working models of each of the four types of instruments named above, so that the reader can see for himself the effects of changing the focal length, using different types of lenses, rotating the lens, and other experiments. Work is only done when there is movement against an opposing force. In a convex lens sometimes called a positive lens, the glass or plastic surfaces bulge outwards in the center giving the classic lentillike shape. The principle behind the lens is the refraction of light. If the light is converging as it leaves the lens, then it comes. More familiar types of waves are sound, or waves on a surface of water. Gcse physics independent study tasks with 91 grade ladder electromagnetic spectrum.
One type of digital camera contains both a converging convex lens and a diverging. In fact, most of it requires some serious brain power. Physics is, among many other topics, the study of energy, mechanics, atoms, space and of the physical environment. A lens is a transmissive optical device that focuses or disperses a light beam by means of refraction. Then the two sides are combined to come up with the name of the lens. The focal point is where rays hitting the lens parallel to the axis all meet.
Converging convex lenses are used in reading glasses. The optical microscope, also referred to as a light microscope, is a type of microscope that commonly uses visible light and a system of lenses to generate magnified images of small objects. June 2017 is the final examination series in which syllabus 0625 will be included in uk performance tables. Physics 101, learn physics, physics lessons, gcse physics. In fact, youll find familiar names calvin klein and gucci, to name just two on your frames these days. Convex a convex lens is one where the center of the lens.
The language of lenses as we begin to discuss the refraction of light rays and the formation of images by these two types of lenses, we will need to use a variety of terms. Convex lenses is a converging lens it bulges outwards. The center of the curvature of the lens face c is the center of the sphere, where this face is a part of it, the optical center of the lens is a point inside the lens lies on the principal axis in the mid. In both cases, there is a perturbation with a periodic spatial pattern which propagates, or travels in space. A concave lens is flat in the middle and thicker at the edges. Long sight rays of light focus behind the retina, can be corrected with convex lenses. By using refraction, lenses can bend multiple light rays. Gcse light revise lenses and their uses in telescopes. This is a sample from our gcse physics revision podcasts. Gcse physics question paper unit 03 physics june 2017.
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