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MHT CET 2023 (11 May, Shift 2) · YDSE: Fringe Width & Fringe Positions

YDSE: Fringe Width & Fringe Positions question from MHT CET 2023 (11 May, Shift 2)

Q29MHT CET 2023 · 11 MAY · SHIFT 2Easy

YDSE: Fringe Width & Fringe Positions

In Young's double slit experiment, green light is incident on 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 $\beta = \frac{\lambda D}{d}$ .
Reducing $d$ or increasing $D$ increases $\beta$ ; red light ( $\lambda$ larger) increases $\beta$ .
Blue light has smaller $\lambda$ than green, so $\beta$ decreases.
So the answer is (b).

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