Concave mirrors, geometrical optics alevel physics tutor. This data chart guides children in exploring convex and. Before that can be done, the focal point must first be defined. Illuminated and selfluminous objects, reflection of light, experiments investigating mirror, how to do ray diagrams for mirrors, uses of mirrors including plane flat and curved mirrors. A concave mirror with a focal length of 39 cm creates a 9cm high virtual image 25cm from the mirror does this mean my image distance is negative as its. Physics formulas physics experiments engineering science science and technology gcse physics physics and mathematics quantum physics primary science physical science. Convex and concave lenses lenses aqa gcse physics single. Isaac physics a project designed to offer support and activities in physics problem solving to teachers and students from gcse level through to university. Lenses are used in cameras, telescopes, binoculars, microscopes and corrective glasses. A mirror is a very smooth, highly polished piece of metal or plastic that reflects virtually all the light that falls onto it. When the object is less than one focal length away from the converging lens mirror, the image will be virtual and upright.
A convex mirror disperses light like a concave lens and a concave mirror focuses light like a convex lens. In an astronomical telescope, a concave mirror of a diameter of 5 meters or more is used as the objective. Concave mirror, convex mirror, concave and convex mirror s focuses, concave lens, convex lens, concave and convex lens focuses, reflection. An object of length 6 cm is placed on the principle axis. This diagram is comparing and contrasting concave versus convex mirrors. The point in the center of the sphere is the center of curvature. Lets look at what happens to rays of light, traveling at approximately 186,000 miles per second the speed of light, when they strike a concave mirror s surface.
In this online lecture, ms vaneeza abbas explains 10th class physics chapter 12 geometrical optics. The reflection appears to be behind the mirror and may look bigger, smaller, or the same size as the thing it is reflecting, depending on the mirror s shape. For the love of physics walter lewin may 16, 2011 duration. When light is refracted it changes direction due to the change in density as it moves from air into glass or plastic. Answers to ray diagram worksheet gcse science physics 91 triple convex lenses find my revision workbooks here. The image types and positions for a concave mirror are very similar to those of a convex lens. The distance of the focus from the pole of the concave mirror is called its focal length. A concave mirror can be thought of as a slice of a sphere. Mirrors and lenses can be used for a range of uses such as manipulating light. Midway between the vertex and the center of curvature is a. What is the relation between image velocity,object velocity and mirror velocity. Applications and uses of concave mirror in daily life byjus.
This resource is a tutorial in how to draw ray diagrams for concave, convex and plane mirrors. Earlier light was believed to be of wave nature only. Convex lens are thicker in middle than the edges whereas concave lens are thinner at the middle than at the edges. Refraction of two rays at the two surfaces of converging concave lens this page. Images in a plane mirror are the same size as the object, are located behind the mirror, and are oriented in the same direction as the object i. A plane mirror forms an image of an object, which has these properties. We explore what is meant by a convex lens and then we look at how to draw ray diagrams to. In this article, we will learn about image formation by concave and convex mirrors. A concave mirror can focus light rays to a common point f in front of the mirror f is. It provide online study material for free on physics for cbse class 6 to class mirror physics mirror physics are explained in this section.
Gcse science physics 91 triple concave lenses youtube. Refraction is the bending of a light when it enters a medium. A helpful revision guide for convex and concave mirrors, and lenses, such as image magnification, for gcse physics. See also refraction experiments doc browns physics revision notes. For concave mirrors, when the object is between f and the mirror, the image will be behind the mirror and will be enlarged and upright. Plane mirrors are used in periscopes, security mirrors and dressing table mirrors.
Aqa gcse physics p14 light kerboodle answers expert. Physics revisiongcse physicsphysics notes gcse sciencechemistry notesphysical sciencescience lessonsscience symbols. To test this out, stand in front of a single concave mirror and continue to back up until you no longer see an image. One of the easiest shapes to analyze is the spherical mirror. Concave mirrors are also used in making astronomical telescopes. Mirror physics mirror physics are explained in this section. Ray diagrams 4 of 4 concave lens and convex mirror shows how to draw the ray diagrams for locating the image produced by a. Converging and diverging lenses lenses edexcel gcse. This is similar to a magnifying glass, with a practical use as a makeup mirror. In a concave mirror, the principal axis is a line that is perpendicular to the center of the mirror. If the rays are diverging spreading apart after the lens, extend both back to the left to find a place where the lines meet this will be a virtual image. Help with gcse physics, aqa syllabus a as level and a2 level physics. Gcse physics reflection of light from a concave mirror.
Convex mirror concave mirror 922cm corner mirror blind spot office, driveway, offices, stores traffic safety mirror adjustable fixing bracket cubicle mirror convex. A concave mirror is composed of a reflective surface with its sides curved closer in distance to your eye than its middle surface. They come together at a point called the principal focus. Physics revision site recommended to teachers as a resource by aqa, ocr and edexcel examination boards also recommended by bbc bytesize winner of the iop web awards 2010 cyberphysics a physics revision aide for students at ks3 sats, ks4 gcse and ks5 a and as level. The easiest way to visualize what a image will look like in this type of mirror is a ray diagram. The line passing through the center of the sphere and attaching to the mirror is known as the principal axis. Parallel rays of light or other electromagnetic rays are brought to a focus by the concave mirror to form a real image. The type of image produced by a spherical mirror depends upon whether the mirror is concave converging or convex diverging and, for concave mirrors, whether the object is behind or in front of the focal point. Concave mirrors are also known as a converging mirror since the rays converge after falling on the concave mirror while the convex mirrors are known as diverging mirrors as the rays diverge after falling on the convex mirror. V i 2v m v o i ended up with this equation but my reference book suggests v i. You only have to look as far as the nearest bathroom to find an example of an image formed by a mirror. Physics p3 aqa light and mirrors teaching resources.
The powerpower goes over each set and the pdf are learning mats for the pupils they are hand written but fairly neat. The law of reflection gcse physics single science revision bbc. We explore how to draw a ray diagram for a concave lens and then we look at the properties. A concave mirror is used in a reflecting telescope. In this definition the word object may be defined as anything which gives out light rays. Lens are of various types but the two most important types are convex on biconvex and concave or bi concave lens. Concave mirrors are widely used in headlights of automobiles and motor vehicles, torch lights, railway engines, etc. Gcse science physics 91 triple convex lenses youtube. A convex lens is thicker in the middle than it is at the edges. Typically such a mirror is not a complete sphere, but a spherical cap a piece sliced from a larger imaginary sphere with a single cut. For a concave mirror to focus light coming from a distance to a single point, in a similar fashion to a concave lens, it must have a parabolic shape. Determine the focal length of concave mirror physics.
Find an answer to your question determine the focal length of concave mirror physics practical 12 book 1. Links waves light revision questions physics quiz index light quiz. Concave and convex lenses and mirrors, parallel light rays. Reflection of light physics lessons, reflection and. As with concave mirrors, a ray incident on the mirror with an angle of incidence of zero through the centre of curvature will reflect in the opposite direction with zero angle of reflection. Physics of light byjus is the best place to seek tuitions for physics as well as all subjects of science discipline. At the beginning of the 20th century, it became known that the wave theory of light often becomes inadequate for treatment of. Review a concave mirror is designed so that a person 20. What is the relation between image velocity,object. Once youve reached this point, you will be standing one focal length away from the mirror. Answers to edexcel a level physics student book new 91 gcse physics equations sheet. Visually demonstrate how concave and convex mirrors work. Learn about and revise lenses, images, magnification and absorption, refraction and transmission of light with gcse bitesize physics.
The reflection of visible light by mirrors and prisms. You can do a diverging mirror simply by selecting mirror, then pulling the object to the right side. A lens is a shaped piece of transparent glass or plastic that refracts light. If a plane mirror is placed perpendicular to the optic axis at a distanc from the pole, facing concave mirror, find the position and nature of the final image formed.
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