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Q.

A beam of light propagates through a medium 1 and falls onto another medium 2, at an angle α1 as shown in Fig. After that, it propagates in medium 2 at an angle α2 as shown. The light's wavelength in medium 1 is λ1. What is the wavelength of light in medium2?

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a

sinα1sinα2λ1

b

sinα2sinα1λ1

c

cosα1cosα2λ1

d

cosα2cosα1λ1

answer is A.

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A beam of light propagates through a medium 1 and falls onto another medium 2, at an angle α1 as shown in Fig. After that, it propagates in medium 2 at an angle α2 as shown. The light's wavelength in medium 1 is λ1. What is the wavelength of light in medium2?