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.
