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MHT CET 2026 (14 May, Shift 1) · YDSE: Film, Medium & Two Wavelengths

YDSE: Film, Medium & Two Wavelengths question from MHT CET 2026 (14 May, Shift 1)

Q1MHT CET 2026 · 14 MAY · SHIFT 1Easy

YDSE: Film, Medium & Two Wavelengths

The thickness of a plate (refractive index $\mu$ ) which will produce a change in optical path equal to half the wavelength $\lambda$ of the light passing through it normally, is

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Answer: (d)

Extra optical path due to plate $= (\mu-1)t$ .
$(\mu-1)t = \frac{\lambda}{2} \Rightarrow t = \frac{\lambda}{2(\mu-1)}$
So the answer is (d).

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