b)
20 a)

b)

0000PHT110121905

Describe with figure the construction and reconstruction of a hologram.
Develop an expression for numerical aperture of a step index fibre. Explain the
fibre optic communication systemwith block diagram.

An optic fibre has core of refractive index 1.6 and cladding of refractive index
1.58. If this fibre is immersed in a liquid of refractive index 1.4, evaluate

numerical aperture and acceptance angle.

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