Answer on Optics Question for Nikhil
a) Discuss three important practical applications of lasers.
b) Calculate the ratio of stimulated emission and spontaneous emission at an operating
temperature of 1100 K, if the wavelength of emitted light is 550 nm. Do these conditions
correspond to a laser?
c) State the characteristics of different types of optical fibres. Depict their refractive index
profiles and propagation of light through them.
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