APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY Previous Years Question Paper & Answer
University : APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY
Course : B.Tech
Semester : SEMESTER 1
Subject : ENGINEERING PHYSICS B
Year : 2019
Term : DECEMBER
Branch : MECHANICAL ENGINEERING
Scheme : 2019 Full Time
Course Code : PHT 110
Page:3
PDF Text (Beta):
B NSA192003 Pages:3
छ) What are Einstein’s coefficients?Give their significance in lasing action. (4)
20 a) Explain total internal reflection. With the help of a neat diagram derive (10)
expression for numerical aperture of a step index fibre.
b) An optic fibre has an acceptance angle of 450. If the refractive index of core (4)
is 1.57, calculate numerical aperture and refractive index of cladding.
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