Wave Optics

JEE Main level, single correct, medium

42 of 191

Question 42 of 191

In a Young's double slit experiment, the slits are separated by 0.2 mm. If the slits separation is increased to 0.4 mm , the percentage change of the fringe width is:

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Answer: (C) 50%50 \%

β=Dλ d∝1 d\beta=\frac{\mathrm{D} \lambda}{\mathrm{~d}} \propto \frac{1}{\mathrm{~d}}
If d is doubled then β\beta is half so 50%50 \% decrement.

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