Optics Question 464

Question: In Young’s double-slit experiment, the slits are illuminated by monochromatic light. The entire set-up is immersed in pure water. Which of the following act cannot restore the original fringe width?

Options:

A) Bringing the slits close together.

B) Moving the screen away from the slit plane.

C) Replacing the incident light by that of longer wavelength.

D) Introducing a thin transparent slab in front of one of the slits.

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Answer:

Correct Answer: D

Solution:

[d] $ {\beta _{w}}=\frac{\lambda D}{\mu d} $ We need to increase $ \beta \Rightarrow D $ increases; d decreases.



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