Question

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).​

Answer 1

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