In figure, the optical fiber is I =2 m long and has a diameter of d =d20 m. If a ray of light is incident on one end of the fiber at angle =4 , the number of reflection it makes before emerging from the order end is close to

(reflective index of fiber is 131 and sin =0.64)

In figure, the optical fiber is I =2 m long and has a diameter of d =d20 m. If a ray of light is incident on one end of the fiber at angle =4 , the number of reflection it makes before emerging from the order end is close to

(reflective index of fiber is 131 and sin =0.64)

1 Answer

127 votes

1 sin4 = 1.31 sin

⇒sin 3

I = 20 m cot

∴ N =

= =57735

N=57000.

127 votes

127