An optical fibre consists of core of surrounded by a cladding of
. A beam of light enters form air at an angle
with axis of fibre. The highest
for which ray can be travelled through fibre is
a) |
|
b) |
|
c) |
|
d) |
|
An optical fibre consists of core of surrounded by a cladding of
. A beam of light enters form air at an angle
with axis of fibre. The highest
for which ray can be travelled through fibre is
a) |
|
b) |
|
c) |
|
d) |
|
(b)
Here the requirement is that
From Snell’s law …(ii)
Also in
Hence from equation (ii)
From equation (i) and (iii)