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MHT CET 2020 (16 Oct, Shift 1) · YDSE: Fringe Width & Fringe Positions

YDSE: Fringe Width & Fringe Positions question from MHT CET 2020 (16 Oct, Shift 1)

Q60MHT CET 2020 · 16 OCT · SHIFT 1Easy

YDSE: Fringe Width & Fringe Positions

In Young's double slit experiment green light is incident on the two slits. The interference pattern is observed on a screen. Which one of the following changes would cause the observed fringes to be more closely spaced?

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Answer: (b)

Closer fringes means smaller $\beta = \frac{\lambda D}{d}$ .
Moving the screen away, reducing $d$ or using red light all increase $\beta$ .
Blue light has smaller $\lambda$ than green, so $\beta$ decreases.
So the answer is (b).

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