Physics
(i) Write a relationship between angle of incidence and angle of refraction for a given pair of media.
(ii) When a ray of light enters from one medium to another having different optical densities it bends. Why does this phenomenon occur?
(iii) Write one condition where it does not bend when entering a medium of different optical density.
Refraction Plane Surfaces
ICSE 2016
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Answer
(i) The ratio of the sine of angle of incidence 'i' to the sine of angle of refraction 'r' is constant for the pair of given media. This constant is called the refractive index.
1μ2 =
(ii) It occurs due to change in speed of light as it enters from one medium to other medium having different optical density. If light slows down in the second medium, it bends towards the normal and if light speeds up, it bends away from the normal.
(iii) When the ray of light is incident normally on the surface of second medium, it does not bend and passes undeviated.
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