Optics Question 1097

Question: A thin mica sheet of thickness $ 2\times {{10}^{-6}}m $ and refractive index $ (\mu =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 $ =\frac{\beta }{\lambda }(\mu -1)\ t=\frac{\beta }{(5000\times {{10}^{-10}})}(1.5)\times 2\times {{10}^{-6}}=2\beta $ i.e., 2 fringes upwards.



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