A flint glass and a crown glass are fitted on the two slits of a double slit apparatus. The thickness of the strips is 0.40 mm and the separation between the slits is 0.12 cm. The refractive index of flint glass and crown glass are 1.62 and 1.52 respectively for the light of wavelength 480 nm which is used in the experiment. The interference is observed on a screen a distance one meter away.
Text Solution
Verified by ExpertsCHECK THE SOLUTION.
β = 4.0 × 10 –4 m
and 
Sol. By inserting the strips, β does not change.
β = 
= 
= 4.0 × 10 –4 m.
Lets try to find out the point at which path difference is zero. (central maxima).
So at P; path difference due to extra travelling (i.e. dsin θ ) must be equal to the optical path difference.
at centre point path difference = ( μ 2 – μ 1 ) t = 83.33 λ
so as we move up path difference will decrease so at height 
we will get maxima and at a distance 
on lower side maxima will formed.
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