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MHT CET 2026 (18 Apr, Shift 1) · YDSE: Film, Medium & Two Wavelengths

YDSE: Film, Medium & Two Wavelengths question from MHT CET 2026 (18 Apr, Shift 1)

Q11MHT CET 2026 · 18 APR · SHIFT 1Medium

YDSE: Film, Medium & Two Wavelengths

When a glass plate of refractive index $1.44$ is introduced in the path of one of the interfering beams, the fringes are displaced by a distance ' $y$ '. If this plate is replaced by another plate of same thickness but of refractive index $1.66$ , the fringes will be displaced by a distance

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Answer: (d)

Shift $y = \frac{(\mu-1)tD}{d} \propto (\mu-1)$ for the same $t$ .
$\frac{y'}{y} = \frac{1.66-1}{1.44-1} = \frac{0.66}{0.44} = \frac{3}{2}$
So the answer is (d) $\frac{3y}{2}$ .

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