16 Total internal reflection is the phenomenon that involves the reflection of all the incident light off the boundary Light must travel from denser to rarer medium and angle of incidence in denser medium must
de greater than critical angle ( for the pair of media in contact. For internal reflection we can show that
1
sinc
( Chical angle for glass air interface where u of glass is 3/2 is
(6) 60°
(C) 30
(d) 44.3
(Catical angle for water air interface is 486. What is the refractive index of water?
(a)
(c) 4/3
(d) 3/4
(w) Critical angle for air water interface for violet colour is 49º. Its value for red colour would be
(b) 50°
(c) 48°
(a) 52
( A point source of light is held at a depth k below the surface of water. If Cis critical angle of air-water
interface, the diameter of circle of light coming from water surface would be
(a) 2 tanc
(6) k tanc
(c) h sinc
(d) h/sinc
If the critical angle for total internal reflection from a medium to vaccum is 30°, then the velocity of light
in the mediam is
(a) 3x108 m/s (6) 1.5 x 108 m/s (c) 6x 10 m/s
(a) V3 x 108 m/s