Lenses are made from materials such as glass or plastic, and are. Written by teachers for teachers and students, the physics classroom provides a wealth of resources that meets the varied needs of both students and teachers. Convex lenses, geometrical optics from alevel physics tutor. This short video covers some of the terminology you need to know when learning about lenses over the next few videos. Lenses are found in a huge array of optical instruments, ranging from a simple magnifying glass to the eye to a cameras zoom lens. Compound microscope it consists of two lenses with one nearer the object called the objective lens and the other nearer the eye called the eyepiece lens. Converging and diverging lenses lenses edexcel gcse. Download it once and read it on your kindle device, pc, phones or tablets. Download revision notes for ray optics and optical class 12 notes and score high in exams. Lenses in optics applications types of lenses physics.
Convex and concave lenses lenses aqa gcse physics single. Lenses are made from materials such as glass or plastic, and are ground and polished or molded to a desired shape. Refraction of two rays at the two surfaces of converging concave lens this page. Gcse science physics 91 triple concave lenses youtube. A lens is a shaped piece of transparent glass or plastic that refracts light. Drawing lens diagrams gcse physics revision science. The word lens derives from the latin word for a lentil bean, the shape of which is similar to the convex lens in figure 25. All four types of convex lens are converging lenses. A converging lens is thicker in the middle than it is at the edges. So lets talk about lenses, a lens is a curved piece of glass or some other transparent material that were going to use to focus light and generate some images. This book is full of clear notes and examstyle practice questions covering every a2 physics topic for the aqa a exams. 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. 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. Describe properties of a thin lens and the purpose of ray tracing.
So lets see how it goes, suppose that ive got an object out here in air and then ive got a piece of glass thats curved outward like this in a convex way. Now, back to our regularly scheduled physics lesson. A lens is a transmissive optical device that focuses or disperses a light beam by means of refraction. Snells law and refraction principles are used to explain a variety of realworld phenomena. Gcse science physics 91 triple convex lenses duration.
In the first part of this gcse physics revision video, hazel teaches you the meaning of key definitions such as convex, concave, focal length and principal focus. Employ the thin lens equation to describe and locate the image formed by a lens. Free optics books download ebooks online textbooks tutorials. Rays of light that pass through the lens are brought closer together they converge. As theres always room for improvement you can study some notes to help you excel through your studies. Physics required practical book revision guide for aqa printed by amazon extended revision. Apr 10, 2020 lenses are found in a huge array of optical instruments, ranging from a simple magnifying glass to a cameras zoom lens to the eye itself. A lens is conventionally defined as a piece of glass which is used to focus or change the direction of a beam of light passing through it they are mainly made of glass or plastic. The best physics o level notes o and a level notes.
In this section, we will use the law of refraction to explore the properties of lenses and how they form images. Learn about and revise lenses, images, magnification and absorption, refraction and transmission of light with gcse bitesize physics. How high is the image of the print on the retina when the book is held 30. 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. When light is refracted it changes direction due to the change in density as it moves from air into glass or plastic. The free version includes one topic to get you started thats over 100 questions, and youll get a different mixture every time you take a test. Use features like bookmarks, note taking and highlighting while reading alevel physics. It adopts a practical, supportive approach to help students with their learning. The camera, geometrical optics from alevel physics tutor. Suitable for gcseigcse physics science courses or their equivalent. Types of lens lenses ccea gcse physics single science.
Lens are used in making spectacles, cameras, cinema projectors, microscopes and telescopes. Drawing lens diagrams gcse physics revision science with. The focal length f of a lens can be found quite accurately by moving an illuminated object infront of a lens so that an image is cast on a screen. Alevel physics revision edexcel physics alevel revision notes.
Leaving cert physics all notes have been updated as of november 2010 and now include exam questions plus solutions and related syllabus extracts. Dec 05, 2019 this amazing revision app will test your physics knowledge in oneminute bursts. Lenses are used in cameras, telescopes, binoculars, microscopes. The physics classroom serves students, teachers and classrooms by providing classroomready resources that utilize an easytounderstand language that makes learning interactive and multidimensional. How can you measure the focal length of a convex lens. These are some of them along with videos which would prove really helpful even if you want to start from scratch.
A convex lens is also known as a converging lens because it bends the parallel light rays entering them inward and converges them at a point known as focal length. For webquest or practice, print a copy of this quiz at the physics. 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. For more about the image formed by a convex lens watch the next tutorial on this channel. Optics began with the development of lenses by the ancient egyptians and. Revision exam and assessment guidance questions throughout consolidate this learning. That means we have been playing with lenses for a long time. Stay tuned with byjus to learn more about image formation by concave and convex lenses and explore more on physics formulas and calculators.
Feb 01, 2018 the thin converging lens igcse physics duration. The whole things designed to make revision straightforward everything you need to know is explained simply and thoroughly, helped by fullcolour diagrams. Lenses ccea gcse physics single science revision ccea. The basic ray diagram for a convex lens introduces a number of important terms.
This book is full of clear notes and examstyle practice questions covering every as physics topic for the aqa a exams. Revision for aqa physics gcse, including summary notes, exam questions by topic and videos for each module. The function of a lens is to increase or decrease the curvature of a wavefront. Lenses are used in cameras, telescopes, binoculars, microscopes and corrective glasses. This is the curvature which the lens adds to the wavefront. Unless otherwise stated, the lens toretina distance is 2. Download cbse class 12th revision notes for chapter 9 ray optics and optical in pdf format for free. Jan 23, 2018 in the first part of this gcse physics revision video, hazel teaches you the meaning of key definitions such as convex, concave, focal length and principal focus. Mar 05, 2019 class 12 physics notes chapter 9 ray optics and optical. Everyday low prices and free delivery on eligible orders. As light from an object refracts as it passes througha a converging or diverging lenses it bends, allowing up to see images. Gcse science physics 91 triple convex lenses youtube. Our class 12 physics notes contain solutions for all the questions and answers pertaining to all the chapters in the book. After you have the syllabus you need to learn your coursework.
The convex lens shown has been shaped so that all light rays that enter it parallel to its axis cross one another at a single point on the opposite side of the lens. Rays of light that pass through the lens are spread out they diverge. A concave lens is a diverging lens when parallel rays of light pass through a concave lens the refracted rays diverge so that they appear to come from one point called the principal focus. The lens is transparent piece of glass or plastic which has a curved surface. Optics is the branch of physics that studies the behaviour and properties of light, including its. Lenses are found in a huge array of optical instruments, ranging from a simple magnifying glass to a cameras zoom lens to the eye itself.
Class 12 physics notes chapter 9 ray optics and optical. Lenses are a lot more complicated than mirrors because light passes through them instead of just bouncing off them. Power is measured in dioptres, d, and is given by the formula. Over 900 quickfire questions all the practice youve ever dreamed of, plus. The best physics o level notes compiled from all around the world at one place for your ease so you can prepare for your tests and examinations with the satisfaction that you have the best resources available to you. All notes have been updated as of november 2010 and now include exam questions plus solutions and related syllabus extracts.
In this section, we use the snells law to explore the properties of lenses and how they form images. Overall, then, the formula relating the curvature of the wavefronts leaving a lens to the curvature of the wavefronts entering it is. Physics igcse 2012 exam revision notes by samuel lees and adrian guillot 1. Ray diagrams and images lenses edexcel gcse physics. This book provides comprehensive and authoritative guidance for the course. All the questions on this quiz are based on information that can be found at physics. Lenses are found in a huge array of optical instruments, ranging from the simple magnifying glass to a camera lens to the lens of the human eye. Waves and photons, the physics of waves,the huygensfresnel principle, diffraction, maxwells equations, polarisation, fermats principle, spherical lenses and mirrors, crystal symmetry and optical instruments.
The word lens derives from the latin word for lentil beanthe shape of which is similar to that of the convex lens as shown in. Optician study guide, standards, practice tests, programs, videos and apps to help you prep for. Use the diagram to determine the focal length of the lens. In this section, we use the snells law to explore the properties of. Jan 30, 2018 gcse science physics 91 triple concave lenses duration. Lenses are precisely shaped pieces of glass that have been developed and used in corrective glasses, telescopes, microscopes, binoculars, and magnifying glasses. That is, they bring parallel rays of light to a focus, producing a real image. Life is too short for all that permission and lark. The ray nature of light is used to explain how light refracts at planar and curved surfaces. Physics revision notes for class 12, short key notes for. What is the power of the eye when viewing an object 50. Physics study guideoptics wikibooks, open books for an open world. Class 12 physics revision notes, short key notes for cbse ncert books class 12 physics notes given by vedantu are a very reliable and trustable set of notes for the exam preparation. Distances from lenses to imaginary objects and imaginary images are negative.
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. You can use the notes provided in this link to study this topic. Calculate the power of the eye when viewing an object 3. They come together at a point on the principal axis called the principal focus f. Ancient egyptians, babylonians, and greeks, all had a sense of basic optics. Alevel physics advancing physicslenses wikibooks, open. 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. Ray optics and optical class 12 notes physics mycbseguide. The convex lens is shaped so that all light rays that enter it. To register physics tuitions on to clear your doubts. Gcse science physics 91 triple concave lenses duration. Physics is the scientific study of matter and energy and how they interact with each other.
Icse class 10 physics chapter 5 refraction through lens. A concave lens is thin in the middle and thicker at the edges. 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. These are the ray optics and optical class 12 notes prepared by team of expert teachers. The fullscale diagram below shows a converging lens and an object. Isaac physics a project designed to offer support and activities in physics problem solving to teachers and students from gcse level through to university. 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. Lenses in optics applications types of lenses physics byjus.