# Answer to Question #50563 in Optics for NIKHIL

Question #50563

1. Answer any four parts: (5×4 = 20)

a) Consider a wave represented as y(x, t) = 2sin(10πt−πx/40+π/4) . Plot the space profile at t = 4/T and time profile at x = λ/8.

b) Describe polarization of light by double refraction. Draw o- and e- wave surfaces for

calcite and quartz.

c) Explain the concept of population inversion on the basis of Einstein’s A & B coefficients.

Discuss its significance for developing a LASER.

d) What is a zone plate? Show that it acts as a multi-foci converging lens.

e) Discuss the concept of missing orders with particular reference to double slit diffraction

pattern.

a) Consider a wave represented as y(x, t) = 2sin(10πt−πx/40+π/4) . Plot the space profile at t = 4/T and time profile at x = λ/8.

b) Describe polarization of light by double refraction. Draw o- and e- wave surfaces for

calcite and quartz.

c) Explain the concept of population inversion on the basis of Einstein’s A & B coefficients.

Discuss its significance for developing a LASER.

d) What is a zone plate? Show that it acts as a multi-foci converging lens.

e) Discuss the concept of missing orders with particular reference to double slit diffraction

pattern.

Expert's answer

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