Optics Question 1112

Question: Two parallel slits 0.6 mm apart are illuminated by light source of wavelength 6000 Å. The distance between two consecutive dark fringes on a screen 1 m away from the slits is

[JIPMER 1999]

Options:

A) 1 mm

B) 0.01 mm

C) 0.1 m

D) 10 m

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Answer:

Correct Answer: A

Solution:

Distance between two consecutive Dark fringes $ =\frac{\lambda D}{d}=\frac{6000\times {{10}^{-10}}\times 1}{0.6\times {{10}^{-3}}} $

$ =1\times {{10}^{-3}}m=1\ mm. $



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