Question

A beam of light of wavelength 400 nm is incident normally on a right angled prism as shown. It is observed that the light just grazes along the surface AC after falling on it. Given that the refractive index of the material of the prism varies with the wavelength λ as per the relation: $\mu_{A}=1.2+\frac{b}{\lambda^{2}}$.Calculate the value of b and the refractiveindex of the prism material for a wavelength λ = 5000 Å. [Given θ = sin⁻¹ (0.625)]

Answer 1

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