Questions
A ray of light of wavelength and frequency enters a glass slab of refractive index from air. Then
a
Its wavelength increases, frequency decreases
b
Its wavelength decreases, frequency remains same
c
Its wavelength increases, frequency increases
d
Δλ=λ01μ-1 and Δν=0
detailed solution
Correct option is B
Whenever a ray goes from one medium to another, its frequency remains same. Its wavelength changes in accordance with μλ= constant. i.eμ0λ0=μλ (∴μ0=μair=1)λ0=μλλ=λ0μ(<λ)So, λ decreases when it goes rarer to denser medium and vice versa.Δλ=λ−λ0Δλ=λ0(1μ−1)Δλ=λ0(1μ−1) and Δv=ν-ν=0Talk to our academic expert!
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