On placing a thin film of mica of thickness 12 × 10⁻⁵ cm in the path… | MHT CET 2023 (14 May, Shift 2)

Q40MHT CET 2023 · 14 MAY · SHIFT 2Medium

YDSE: Film, Medium & Two Wavelengths

On placing a thin film of mica of thickness $12 \times 10^{-5}\text{ cm}$ in the path of one of the interfering beams in Young's double slit experiment using monochromatic light, the fringe pattern shifts through a distance equal to the width of bright fringe. If $\lambda = 6 \times 10^{-5}\text{ cm}$ , the refractive index of mica is

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Answer: (c)

Shift of one fringe width: $(\mu-1)t = \lambda$ .
$\mu - 1 = \frac{6\times10^{-5}}{12\times10^{-5}} = 0.5$
So $\mu = 1.5$ , answer (c).

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YDSE: Film, Medium & Two Wavelengths question from MHT CET 2023 (14 May, Shift 2)

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