A monochromatic light wave with wavelength λ₁ and frequency ν₁ in air enters another medium. If incidence and refraction angles are 45° and 30°, respectively, then λ₂ and ν₂ are:
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Question

A monochromatic light wave with wavelength λ₁ and frequency ν₁ in air enters another medium. If incidence and refraction angles are 45° and 30°, respectively, then λ₂ and ν₂ are:

G1 Physics · Accepted Answer

Frequency does not change on refraction. Snell's law gives n₂/n₁=sin45°/sin30°=√2, so speed and wavelength reduce by √2. Therefore λ₂=λ₁/√2 and ν₂=ν₁. Option B.