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An electromagnetic radiation of frequency n, wavelength λ, travelling with velocity v in air enters in a glass slab of refractive index (μ). The frequency, wavelength and velocity of light in the glass slab will be respectively

1. n, λ/μ, v/μ
2. n, 2λ, v/μ
3. n, λ/μ, μv
4. 2πn, λ/μ, μv

Correct answer: n, λ/μ, v/μ

Solution

When light enters a medium with refractive index μ, its frequency (n) remains unchanged, while its wavelength (λ) and velocity (v) decrease by a factor of μ. Thus, the wavelength becomes λ/μ and the velocity becomes v/μ.

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