P3.1- Lenses Part 1 0.0 / 5 ? PhysicsMedical PhysicsGCSEAQA Created by: chocolatehousesCreated on: 25-04-15 13:50 Refraction is the change of direction of light as it passes from one medium to another 1 of 18 The refractive index is how much a substance can refract a ray of light 2 of 18 And you work that out by... sin i / sin r 3 of 18 The light rays in optical fibres are constantly internally reflected 4 of 18 Why? because it is at an angle greater than the critical one 5 of 18 A use of optical fibres: endoscopes- they are flexible rods that are used to see inside the body directly 6 of 18 The critical angle is the angle of incidence of a light ray in a transparent substance that produces refraction along the boundary 7 of 18 And you work that out by.. n = 1/sin c so sin c= 1/ n 8 of 18 Lenses are optical devices that bend light by refraction 9 of 18 A converging lens is also known as a convex lens, the light rays come together 10 of 18 A diverging lens is also known as a concave lens, the light rays spread apart 11 of 18 The power of a lens is measured in dioptres 12 of 18 And the equation is 1/ focal length (m) 13 of 18 A real image can be projected onto a screen 14 of 18 A virtual image can not be projected onto a screen 15 of 18 Magnified means the image is bigger 16 of 18 Diminished means it's smaller 17 of 18 Inverted means it's upside down 18 of 18
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