Question

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

(a) n, 2λ and v/μ

(b) 2n/μ, λ/μ and v

(c) n/μ, λ/μ and v/μ

(d) n, λ/μ and v/μ

Answer 1

Correct option (d) n, λ/μ and v/μ

Explanation:

Frequency = n; Wavelength =λ; Velocity of air = v and refractive index of glass slab = μ. Frequency of light *** the same, when it changes the medium. Refractive index is the ratio of wavelengths in vacuum and in the given medium. Similarly refractive index is also the ratio of velocities in vacuum and in the given medium.