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NEET 2001 (AIPMT) · Wave Theory, Wavefronts & Doppler Effect

Wave Theory, Wavefronts & Doppler Effect question from NEET 2001 (AIPMT)

Q25NEET 2001 · AIPMTEasy

Wave Theory, Wavefronts & Doppler Effect

A ray of light travelling in air has wavelength $\lambda$ , frequency n, velocity v and intensity $I$ . If this ray enters into water then these parameters are $\lambda$ ', n', v' and $I$ ' respectively. Which relation is correct from following?

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Answer: (b)

Frequency is fixed by the source and does not change on refraction.
In water $v' = v/\mu$ and $\lambda' = \lambda/\mu$ , and part of the light is reflected so $I' < I$ .
So the answer is (b) $n = n'$ .

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