For mains electricity, you should be able to explain that a live wire may be dangerous even when a switch in the mains circuit is open and also the dangers of. Work is only done when there is movement against an opposing force. F optical axislight rays that come in parallel to the optical axis still diverge from the focal point. A converging lens is any piece of transparent material that will converge parallel rays of light down to a point converging lenses are thicker in the middle than at the edges. Then, well learn about forces, momentum, energy, and other concepts in lots of different physical situations.
Rays of light entering a converging lens parallel to its axis converge at its focal point f. Another photographic book that will be of more general interest. 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. Ray tracing is the technique of determining or following tracing the paths that light rays take. A series of free gcse igcse physics notes and lessons with examples and solutions. What are ray diagrams ray diagrams for a convex lens and a concave lens are different but to draw any ray diagram you only need to know two things 1. Isaac physics a project designed to offer support and activities in physics problem solving to teachers and students from gcse level through to university. Gcse physics mathematics occams razor math books book drawing brain waves science nature law knowledge 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 of. Physics is the study of the basic principles that govern the physical world around us. Physics diagram ray tracing diagram for convex lens with. You will no doubt know someone who wears lenses, or you may even wear them yourself if you own a pair of spectacles. They summarize most of the necessary topics to succeed in the pgre. The diagram below shows the cross section of a human eye.
A lens can be converging convex or diverging concave. Learn about and revise lenses, images, magnification and absorption, refraction and transmission of light with gcse bitesize physics. In this trivia questions quiz, you will get to learn some more about the different lenses and mirrors and how they differ from each other. Covering the main exam boards, revision is made easy for students with a free onthego app, practice questions and stepbystep support.
This is a combination of two lenses, one convex and the other concave. Converging lenses gcse physics doodle science youtube. Power point uses slides from resources on tes and the worksheets are from btec collins resources. Gcse physics syllabus eight subject areas explained in.
A lens is a transmissive optical device that focuses or disperses a light beam by means of refraction. Scroll down the page for lessons and examples for the following topics. Aqa gcse 91 physics teacher pack 9780008158811 isbn 9780008158774 only the student book is approved by aqa and other resources have not been entered into the approval process. Gcseigcse physics solutions, examples, worksheets, videos. Table 1 summarizes the three types of images formed by single thin lenses. A concave lens will disperse light and make an image that is always virtual, upright and smaller than the object. Lenses 1 of 5 lens combinations two converging lenses visit. Keeping up with your studies now schools are closed. Converging and diverging lenses lenses edexcel gcse. How to organise gcse physics topics for revision now that you have an overview of the topics that could come up in the exam, the next step is to organise them into a revision schedule. Gcse practice papers welcome to our tips and practice papers.
What is a lens a lens is a transparent curved device that is used to refract light a lens is usually made from glass. Gcse science physics 91 triple convex lenses youtube. By using refraction, lenses can bend multiple light rays. A lens is a curved piece of glass or plastic designed to refract light in a specific way. We specialise in free practice tests and all the admissions info you need in one place. What type of lens is thicker in the middle than at the edges. Spherical lenses summary the physics hypertextbook.
Sep 07, 2011 a guide to support non specialists with the lenses aspects of the new edexcel gcse. Convex converging lenses can form either real or virtual images cases 1 and 2, respectively, whereas concave diverging lenses can form only virtual images always case 3. Image formation by lenses physics simple book production. Converging convex lenses are used in reading glasses. Note that a converging lens has a thicker waist, whereas a diverging lens has a thinner waist.
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. The best physics o level notes o and a level notes. Lenses in optics applications types of lenses physics. The lens types used to build a compound lens may have different refractive indices and other properties. The focus of the concave lenses is where rays parallel to principal come from. Both types of lens can be used to form sharp images of a point object placed on one side of them. An expanded view of the path taken by ray 1 shows the perpendiculars and the angles of incidence and refraction at both surfaces. A lens is any piece of transparent material with at least one curved surface there are two types of lenses.
Diverging lenses, like those worn by people with myopia or nearsightedness, have negative refracting powers. The diagram below shows the cross section of a human eye light from an object passes through the cornea which is a transparent dome like structure covering the iris. A piece of a transparent medium bounded by at least one spherical surface, is called a spherical lens. Aqa gcse physics student book sample chapter by collins. The gcse physics syllabus states that for electric circuits, students should be able to draw and interpret circuit diagrams, including switch, lamp, fixed resistor and variable resistor. 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. Which row of the table describes the images produced by a converging lens. Compound lenses are those constructed out of a combination of different simple lenses. Ray diagrams show the types of images formed by convex and concave lenses. 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. A convex lens is thicker in the middle than it is at the edges. 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. Just how much do you know about the different types of lenses and mirrors.
Physics gre comprehensive notes these set of notes were written while studying to take the physics gre. Gcse 91 revision guides and exam practice books from scholastic are written by experts and fully matched to the gcse 91 specifications. If the light is converging as it leaves the lens, then it comes. Lensesthere are 2 basic types of lenses a converging lens convex a diverging lens concave takes light takes light rays and bring rays and spreads them outward.
Jun 19, 2015 lenses 3 lenses are used in spectacles to treat some vision defects. Learn about and revise lenses and their power, real and virtual images, and ray diagrams with gcse bitesize physics. Types of lenses there are different ways to classify lenses. The two main types of lenses in physics concave and convex lenses can be represented by the two symbols in this video tutorial. Other types of lenses another way to classify lenses is by the curve of the glass on each side of the lens. Experiments involve deciding what type od lenses pupils are given and calculating focal length. 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. Gcse light revise lenses and their uses in telescopes. Lens are used in making spectacles, cameras, cinema projectors, microscopes and telescopes.
Physics is the scientific study of matter and energy and how they interact with each other. Although aimed at photographers, this book gives a good overview of different types of lenses, how they differ, and what you can use them for. Lenses are made from materials such as glass or plastic, and are ground and polished or molded to a desired shape. Gcse physics question paper unit 03 revision science. Gcse physics syllabus eight subject areas explained in detail.
Aqa gcse physics student book by jim breithaupt isbn. Ancient egyptians, babylonians, and greeks, all had a sense of basic optics. Physics single science physics is the study of energy, forces, mechanics, waves, and the structure of atoms and the physical universe. A diverging lens is any piece of transparent material that will cause parallel rays of light to. The two main lens types are converging lenses and diverging lenses. See more ideas about gcse physics, physics and gcse science. Lenses are curved glasses or transparent materials. Light is a kind of electromagnetic wave em wave for short. All you really need to create one is a spreadsheet or a diary where you can record what you plan to study and when.
Where rays hitting the lens parallel to the axis all meet. No matter your prescription, frame selection, or lifestyle, you can find lenses to fit your needs. This book illustrates basic practical applications of optical principle. Absorb courses can be used online or you can download each unit to use within a vle virtual learning environment. The focus of convex lenses is where rays parallel to principal axis go. Physics notes form 4 free download kcse revision notes pdf. Ray diagrams and images lenses edexcel gcse physics. Electromagnetics, waves, and optics for most people, the nearest distance that objects can be located away from the eye and still seen clearly is. We explore what is meant by a convex lens and then we look at how to draw ray diagrams to show the. 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. Physics notes on the alternative to practical paper. Displaying all worksheets related to practice on lenses class 8 icse. The pair are cemented together not shown using canada balsam glue. Albert einstein theoriesdouble slit experimentchemistry textbookatomic.
Our online physics trivia quizzes can be adapted to suit your requirements for taking some of the top physics quizzes. As light from an object refracts as it passes througha a converging or diverging lenses it bends, allowing up to see images. This short video covers some of the terminology you need to know when learning about lenses over the next few videos. The greater the power a pair of eyeglasses or contact lenses has, the worse is the vision of the person prescribed them. They are called convex and concave what is a convex lens a convex lens is thicker in the middle and thinner at the edges. Gcse physics enjoyable revision with education quizzes. Theres a lot of stuff to learn with physics and its not all straightforward. Lenses edexcel gcse physics single science revision bbc. The course should teach candidates how to make measurements using many different types of instruments.
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. Lenses are a crucial part of our modern lives, they allow us to correct peoples vision, view the stars and examine bacteria. Lenses are used in glasses and contacts to help correct vision. This paper is an alternative to a practical exam, not an alternative to a practical course. See more ideas about gcse physics, gcse physics revision and physics revision. Jan 11, 2018 the two main types of lenses in physics concave and convex lenses can be represented by the two symbols in this video tutorial. The distance from the center of the lens to the focal point is the lenss focal length f. The light rays are refracted by the cornea onto the lens. Nature of image formed by convex lens and concave lens. The distance between the middle of the lens and its focal point. Converging lenses, like those normally found in reading glasses, have positive refracting powers. The s3 physics test and exam will follow the settings of paper 1 in dse, with mcqs and sq.
Below you will find gcse past papers for english and other languages. The placement of lenses are such that they lie on a single axis, and properties like focal length are calculated again for the new compound lens. Short sight a shortsighted person can see close objects clearly they have good short sight, but they cant see distant objects clearly. Jun 12, 2018 for the love of physics walter lewin may 16, 2011 duration. You can go here to learn more about the refraction of light.
A comprehensive database of more than 390 physics quizzes online, test your knowledge with physics quiz questions. Firstly and most importantly, you will find gcse exam practice papers. A lens is a shaped piece of transparent glass or plastic that refracts light. The notes include tips and point out common questions. The ray nature of light is used to explain how light refracts at planar and curved surfaces. 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. Worksheets are the university of the state of new york grade 8, sample work from, this practice book contains physics test, chapter 1 the science of biology summary, reflection and refraction workbook answers, class 7 smart skills syllabus 2016 2017 science, igcse revision questions, gcse. Lenses test questions ccea gcse physics single science. This gcse physics quiz about light looks at lenses. Convex lenses, geometrical optics alevel physics tutor. In the first part of this gcse physics revision video, hazel teaches you the meaning of key definitions such as convex, concave, focal length. One type of digital camera contains both a converging convex lens and a diverging. 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.
Radioactive waste with the longest halflife poses the greatest risk to human health. The detrimental effects of radioactive wastes depend on the quantity, type, halflife of the waste and the type of radioactive rays emitted. As a resource for our gcse maths students i have produced a few maths gcse revision. 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.
Gcse 91 physics extra papers, questions and answers. Lowlevel waste requires minimal shielding during, handling, transport and storage. Snells law and refraction principles are used to explain a variety of realworld phenomena. A useful revision guide to converging and diverging lenses, such as magnifying glasses, for gcse physics. There are two types of lenses, and they each change the perspective of how things look. That means we have been playing with lenses for a long time. In any event, the glue layer is extremely thin and has little effect. Watch all the video tutorials in the waves topic at s. A series of free gcseigcse physics notes and lessons with examples and solutions. Converging lenses concentrate parallel rays of light and diverging lenses cause parallel rays of light to spread out. 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. Experiments, as well as our own experiences, show that when light interacts with objects several times as large as its wavelength, it travels in straight lines and acts like a ray.
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