CONCAVE LENS, A concave lens is wide at the edges and narrow in the middle. Concave lenses cause light rays to diverge (spread out away from each other)., CONVEX LENS, A convex lens is narrow at the edges and wide in the middle. Convex lenses cause light rays to converge (move towards each other, to meet at a single point)., DENSITY, If the particles of a material are very compact (close together) we say the material has ‘high density’., FOCUS, The point at which light rays meet., LIGHT, A type of energy. Light is an electromagnetic wave that is visible to humans., LONG SIGHTED, Light waves travel in straight lines, at a speed of 300 000 000 meters per second in a vacuum., SHORT SIGHTED, If a person is short-sighted, light entering the eye focuses before the retina. Nearby objects appear focused, distant objects appear blurry., NORMAL, All angles are measured between the ray of light and the normal., REFLECTION, When light ‘is incident on’ (hits) a surface and is not absorbed but instead reflects off (bounces off) the surface., REFRACTION, The change in direction of a wave passing from one medium (material) to another, caused by its change in speed.

S2 PHYS REFRACTION

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