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Transcribed Image Text:Pi 4 ems:
1.Find the angle of refraction: (a) when a ray of light is travelling from air to glass at an angle of incidence of 40° , (b) when a ray
of light is travelling from glass to air at an angle of incidence of 20°. (refractive index of glass with respect to air=D1.5)
2.Sunlight strikes the surface of a lake. A diver sees the Sun at an angle of 42° with respect to the vertical. What angle do the
Sun's rays in air make with the vertical?
3.What is the angle of refraction when a ray from air with an angle of incidence of 25° is incident to water? Draw the ray diagram.
Air
4. The light shown in the figure below makes an angle of 20° with the normal NN' in the
linseed oil (n=1.48). Determine angles 0 ande'. Figure (1)
20
Linseed oil
5. A monochromatic light ray f=5.09x10^14 Hz is incident on medium X at 55. The absolute
index of refraction for material X is 1.66. What is material X? Determine the angle of
refraction. Determine the speed of light in medium X. The index of 1.66 is flint. To find the
angle of refraction use Snell's law. 02=30. To find the speed use n=c/v, v=1.8x10^8 m/s.
Figure 2
le
N'
water
Normal
6. A ray of light traveling through air is incident on a smooth surface of water at an angle of
30 to the normal. Calculate the angle of refraction for the ray as it enters the water.
30
55
Air =n1=D1
Air
Material X
Water=n2%3D1.33
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