In the Young's double slit experiment, when a glass plate of… | MHT CET 2026 (20 May, Shift 1)

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YDSE: Film, Medium & Two Wavelengths

In the Young's double slit experiment, when a glass plate of thickness 't' is introduced in the path of one of the slits, the intensity at the position where the central maximum occurred previously remains unchanged. The minimum thickness of glass plate is [refractive index of glass plate = 1.5, wavelength of light in vacuum is $\lambda$ ]

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Answer: (a)

Intensity at the old central point is unchanged if the extra path is a whole number of wavelengths: $(\mu-1)t = n\lambda$ .
Minimum: $n = 1$ , $t = \frac{\lambda}{1.5-1} = 2\lambda$
So the answer is (a) $2\lambda$ .

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YDSE: Film, Medium & Two Wavelengths question from MHT CET 2026 (20 May, Shift 1)

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