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A monochromatic light wave with wavelength λ 1 and frequency ν 1 in air enters another medium. If the angle of incidence and angle of refraction at the interface are 45° and 30° respectively, then the wavelength λ 2 and frequency ν 2 of the refracted wave are:

1. λ 2 = 2 λ 1 , ν 2 = ν 1
2. λ 2 = λ 1 , ν 2 = 2 1 ν 1
3. λ 2 = λ 1 , ν 2 = 2 ν 1
4. λ 2 = 2 1 λ 1 , ν 2 = ν 1

Correct answer: λ 2 = 2 1 λ 1 , ν 2 = ν 1

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