Green light of wavelength 500nm undergoes refraction from air to water. If the speed
of light in air is 3 x 108 ms-1and the refractive index is 4
3
, then calculate the
following.
a. Frequency of light in air.
b. Frequency of light in water.
c. Speed of light in water.
d. Wavelength of green light in water
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Answer:
Wavelength of light on the mast λ
m
=500nm
Refractive index of water n
w
=4/3
Wavelength of light as seen by the diver λ
d
=
n
w
λ
m
∴ λ
d
=
4/3
500
⟹ λ
d
=376nm
As frequency of light does not change in the refraction phenomenon.
Thus the green light is observed by the diver.
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