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MHT CET 2026 (18 Apr, Shift 2) · Wave Theory, Wavefronts & Doppler Effect

Wave Theory, Wavefronts & Doppler Effect question from MHT CET 2026 (18 Apr, Shift 2)

Q6MHT CET 2026 · 18 APR · SHIFT 2Medium

Wave Theory, Wavefronts & Doppler Effect

A plane wavefront of width $x$ , is incident on an air-water interface and the corresponding refracted wavefront has a width y as shown in figure. The refreactive index of air with respect to water in terms of distances w and z is

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Answer: (a)

In the same time, light travels distance $z$ in air and distance $w$ in water.
So $\dfrac{z}{w} = \dfrac{c}{v_w} = {}_a\mu_w$ (water w.r.t. air).
Air w.r.t. water: ${}_w\mu_a = \dfrac{1}{{}_a\mu_w} = \dfrac{w}{z}$ .
So the answer is (a) $\dfrac{w}{z}$ .

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