In Young's double slit experiment, the fringe width of the interference pattern produced on the screen is 2.4. If the experiment is carried out in another medium having refractive index 1.2, the fringe width will be 3em. (a) 1.2 (b) 2 (c) 2.4 (d) 2.88

Answer: (b). In a medium β' = (β)/(μ). β' = (2.4)/(1.2) = 2 μ m So the answer is (b) 2.

In Young's double slit experiment, the fringe width of the… | JEE Main 2026 (5 Apr, Shift 1)

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YDSE: Film, Medium & Two Wavelengths

In Young's double slit experiment, the fringe width of the interference pattern produced on the screen is $2.4\ \mu\text{m}$ . If the experiment is carried out in another medium having refractive index 1.2, the fringe width will be $\underline{\hspace{3em}}\ \mu\text{m}$ .

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Answer: (b)

In a medium $\beta' = \frac{\beta}{\mu}$ .
$\beta' = \frac{2.4}{1.2} = 2\ \mu$ m
So the answer is (b) 2.

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