A ray of light travels from a denser to a rarer medium. After refraction, it
bends away from the normal. When we keep
increasing the angle of incidence, the angle of refraction also increases till the refracted ray gazes
along the interface of two media.The angle of incidence for which it happens is called critical angle.If the angle of incidence is increased further the ray
wil not emerge and it will be reflected back in the denser medium. This phenomenon is called total internal reflection of light.

(a) A point source of light is placed at the bottom of a tank filled with
water, of refractive index µ , to a depth d. The area of the surface of
water through which light from the source can emerge, is:

(b) For which of the following media, with respect to air, the value of
critical angle is maximum ?

(a) Crown glass
(b) Flint glass
(d) Diamond


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