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Green light of wavelength 5460 Å is incident on an air-glass interface. If the refractive index of glass is 1.5, the wavelength of light in glass would be (c = 3 × 10⁸ ms⁻¹)

1. 3640 Å
2. 5460 Å
3. 4861 Å
4. none of the above

Correct answer: 3640 Å

Solution

The wavelength of light in a medium is given by λ_medium = λ_air / μ, where μ is the refractive index. Substituting λ_air = 5460 Å and μ = 1.5, we get λ_glass = 5460 / 1.5 = 3640 Å.

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