A beam of monochromatic light is refracted from vacuum into a medium of refractive index 1.5. The wavelength of refracted light will be:
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Question

A beam of monochromatic light is refracted from vacuum into a medium of refractive index 1.5. The wavelength of refracted light will be:

G1 Physics · Accepted Answer

Step 1: Light frequency stays constant on refraction. Step 2: Speed decreases to c/μ when μ > 1. Step 3: λ = v/f, so wavelength decreases to λ₀/1.5. Final answer: (C) smaller.