The angles of incidence and refraction of a monochromatic ray of light of wavelength at an air glass interface are i and r, respectively. A parallel beam of light with a small spread δλ in wavelength about a mean wavelength is refracted at the same air glass interface. The refracted index μ of glass depends on the wavelength as μ(λ) = a + b/λ² where a and b are constant. Then the angular spread in the angle of refraction of the beam is - VgyanHub

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The angles of incidence and refraction of a monochromatic ray of light of wavelength at an air glass interface are i and r, respectively. A parallel beam of light with a small spread δλ in wavelength about a mean wavelength is refracted at the same air glass interface. The refracted index μ of glass depends on the wavelength as μ(λ) = a + b/λ² where a and b are constant. Then the angular spread in the angle of refraction of the beam is

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