What happens to a light ray when it enters glass from air at an angle, It bends towards the normal, State the law of reflection for angles, Angle of incidence equals reflection angle, A candle is 30 cm in front of a plane mirror How far is its image behind the mirror, 30 cm, A person stands 2 m from a plane mirror What is the distance between person and image, 4 m, Define refractive index in terms of speed, Ratio of light speeds, A material has refractive index 1.5 Calculate the speed of light in it if c = 3.0 × 108 m/s, 2.0 × 108 m/s, Why does a ray bend away from the normal when leaving glass into air, It speeds up, What is the critical angle, angle of Incidence that causes a 90° angle of refraction, State the two conditions for total internal reflection, Light travels from optically denser to optically less dense and angle of incidence exceeds critical, A glass block has critical angle 42° Will total internal reflection occur for incidence 50° inside glass, Yes total internal reflection occurs, A ray in glass strikes the boundary at 30° to the normal if the critical angle is 42° what happens, It refracts into air, What type of lens is used to focus parallel rays to one point, Converging lens, Where is the image formed by a converging lens when the object is beyond 2F, Between F and 2F, Describe the image formed by a converging lens when the object is between F and the lens, Virtual upright magnified, Light enters glass from air with angle of incidence 40° and refracted angle 25° Calculate the refractive index of glass, About 1.52

Light 2

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