Optics Question 1097

Question: A thin mica sheet of thickness 2×10−6m and refractive index (μ=1.5) is introduced in the path of the first wave. The wavelength of the wave used is 5000 Å. The central bright maximum will shift

[CPMT 1999]

Options:

A) 2 fringes upward

B) 2 fringes downward

C) 10 fringes upward

D) None of these

Show Answer

Answer:

Correct Answer: A

Solution:

Shift =βλ(μ−1) t=β(5000×10−10)(1.5)×2×10−6=2β i.e., 2 fringes upwards.

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