Q.
A double slit experiment is performed with light of wavelength 500 nm. A thin film of thickness 2 μm and refractive index 1.5 is introduced in the path of the upper beam. The location of the central maximum will
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a
Remain unshifted
b
Shift downward by nearly two fringes
c
Shift upward by nearly two fringes
d
Shift downward by 10 fringes
answer is C.
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Detailed Solution
If shift is equal to n fringes width, thenn=(μ−1)tλ=(1.5−1)×2×10−6500×10−9=1500×103=2Since a thin film is introduced in upper beam. So shift will be upward.
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