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

Question

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

Options

G1 Physics · Accepted Answer

Frequency does not change at refraction, so ν₂=ν₁. By Snell's law n₂/n₁ = sin45°/sin30° = √2. Since λ∝1/n at fixed frequency, λ₂=λ₁/√2. Hence option B.