When light of wavelength 4000 Aº in vacuum
travels through the same thickness in air and
vacuum the difference in the number of waves
is one. Find the thickness (Hair = 1.0008).
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Answer:
No. of waves in vacuum =
λ
vacuum
x
No. of waves in air
μ
air
λ
vacuum
x
Now
μ
air
λ
x
−
λ
x
=1 (λ
vacuum
=λ)
λ
x
(μ−1)=1
x=
0.0008
λ
=0.5 mm
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