A blue ray of light of 720 THz frequency enters the water from air. The wavelength of the light in air is
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Answer:
Wavelength of light in air λ
a
=0.48×10
−6
m
Wavelength of light in water λ
m
=
μ
λ
a
=
4/3
0.48×10
−6
=0.36×10
−6
m
Frequency of light in air
ν=
λ
a
c
=
0.48×10
−6
3×10
8
=6.25×10
14
Hz
On passing through water (medium), frequency does not change. Hence, it will be 6.25×10
14
Hz in water as well
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