In Young's double slit experiment, two slits S₁ and S₂ are 'd'… | MHT CET 2026 (13 Apr, Shift 2)

Q12MHT CET 2026 · 13 APR · SHIFT 2Medium

YDSE: Film, Medium & Two Wavelengths

In Young's double slit experiment, two slits $S_1$ and $S_2$ are 'd' distance apart and the separation from slits to screen is $D$ . Now if two transparent slabs of equal thickness $0.1$ mm but refractive index $1.51$ and $1.55$ are introduced in the path of beam ( $\lambda = 4000$ Å) from $S_1$ and $S_2$ respectively. The central bright fringe spot will shift by ___ number of fringes.

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Answer: (b)

Net extra optical path $= (\mu_2-\mu_1)t = (1.55-1.51)\times0.1\times10^{-3} = 4\times10^{-6}$ m.
Fringes shifted $n = \frac{4\times10^{-6}}{4000\times10^{-10}} = 10$
So the answer is (b) 10.

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YDSE: Film, Medium & Two Wavelengths question from MHT CET 2026 (13 Apr, Shift 2)

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