Question

In optical fiber, refractive index of inner part is 1.68 and refractive index of outer part is 1.44. The numerical aperture of the fibre is

A
0.5653
B
0.6653
C
0.7653
D
0.8653
Solution
Verified by Toppr

Numerical aperture of fibre = μ21μ22 =1.6821.442
=2.82242.0736 =0.7488=0.8653

Was this answer helpful?
1
Similar Questions
Q1

Optical fibres have ___ transparent layers of different refractive index.

View Solution
Q2

In an optical fibre, the refractive index of the core should be lesser than the refractive index of the cladding.


View Solution
Q3

Light guidance in an optical fibre can be understood by considering a structure comprising of thin solid glass cylinder of refractive index n1 surrounded by a medium of lower refractive index n2.
The light guidance in the structure takes place due to successive total internal reflections at the interface of the media n1 and n2 as shown in the figure. All rays with the angle of incidence i less than a particular value im are confined in the medium of refractive index n1. The numerical aperture (NA) of the structure is defined as sinim.

If two structures of same cross-sectional area, but different numerical apertures NA1 and NA2(NA2<NA1) are joined longitudinally, the numerical aperture of the combined structure is


View Solution
Q4

Find the refractive index of the core of an optical fiber if the critical angle is 60 and the refractive index of the cladding is 3?


View Solution
Q5

Light guidance in an optical fibre can be understood by considering a structure comprising of thin solid glass cylinder of refractive index n1 surrounded by a medium of lower refractive index n2.
The light guidance in the structure takes place due to successive total internal reflections at the interface of the media n1 and n2 as shown in the figure. All rays with the angle of incidence i less than a particular value im are confined in the medium of refractive index n1. The numerical aperture (NA) of the structure is defined as sinim.

If two structures of same cross-sectional area, but different numerical apertures NA1 and NA2(NA2<NA1) are joined longitudinally, the numerical aperture of the combined structure is


View Solution
Solve
Guides