MHT CET Physics question

The beam of light has wavelength 6000 A.U. in air, its wavenumber in glass of refractive index 1.5 will be :

Answer: (C)

Solution

λ_g = 6000/1.5 = 4000 Å = 4×10⁻⁷ m so wavenumber = 1/λ_g = 2.5×10⁶ m⁻¹;

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Question ID VK-076964