Q.
What is the refractive index of the fiber core?
A) 1.556
B) 1.453
C) 1.425
D) 1.626
Explanation
(c) Taking refraction from air to core of optical fiber. Then,
$\frac{\mu_{1}}{\mu_{0}} = \frac{\sin{10{^\circ}}}{\sin{7{^\circ}}} = \frac{0.1736}{0.1219} = 1.424$
or $\mu_{1} = 1.424\ \ (as\ \mu_{2} = 1)$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.