= 1.41 sin i
11
sin 450
30°
1
2
21 =
sin
2
= 1-33 is less than the refractive index of medium 2, therefore, refraced
3
( The refractive index of water
bends leas in water than in medium 2. Hence, angle of refraction increases.
UNSOLVED NUMERICALS FOR PRACTICE
(Ans. 19.500
refractive index of glass is 1.5.
Ans. 1-33)
1. A ray of light travelling in air strikes a glass slab at an angle of 30°. Calculate the angle of refraction't
2. A ray of light travelling in air strikes the water surface at an angle of 40°. Calculate the refractive index of
3. The velocity of light in air is 3 x 108 m s-l and velocity of light in glass slab is 2 x 108 ms. Find the
4. Light enters from air into diamond which has a refractive index of 2.42. Calculate the speed of light in diamond
water if angle of refraction is 29º.
(Ans. 15
The speed of light in air is 3.0 x 108 m ! [C. B.S. E. (All India) 2005, 2011) (Ans. 1.24 x 108 m si
5. Light enters from air into water which has a refractive index of 1.33. Calculate the speed of light in water
The speed of light in air is 3-0 * 108 m s-1
(C. B.S. E.(All India) 2005) (Ans. 2.26 x 108 mshi​