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.
1
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2015-08-13T02:50:18-0400
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