Ray Optics-Snell's Law (KVPY Stream SB-SX (Class 12 & 1st Year BSC) Physics): Questions 6 - 6 of 6

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Question number: 6

» Ray Optics » Snell's Law

Appeared in Year: 2014

MCQ▾

Question

The angles of incidence and refraction of a monochromatic ray of light of wavelength λ 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 λ is refracted at the same air-glass interface. The refractive index µ of glass depends on the wavelength λ as μ(λ)=a+bλ2 where a and b are constants. Then the angular spread in the angle of refraction of the beam is –

Choices

Choice (4) Response

a.

2b(a+bλ2)siniλ3δλ

b.

Siniλ3cosrδλ

c.

2btanraλ3+bλδλ

d.

2bλ3δλ

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