SaraNextGen.Com

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)



Question ID - 152425 | SaraNextGen Top Answer

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)

1 Answer
127 votes
Answer Key / Explanation : (b) -

(b)

Here the requirement is that

From Snell’s law         …(ii)

Also in

Hence from equation (ii)

From equation (i) and (iii)

127 votes


127