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If at angle thetathe light takes maximum...

If at angle `theta`the light takes maximum time to travel in optical fiber. Then the maximum time is `x xx10^(-8)`, calculate x.

Text Solution

Verified by Experts

The correct Answer is:
x=5

`1.5 sin theta_(c)=1.44 sin 90^(@)`
`sin theta_(c)=1.44/1.50 =24/25`
`:. Sin theta_(c)=x/d=24/25`
`d=(25x)/24`
`:.` total length travel by light `=25/24xx9.6 =10m`
`:. T=S/(C/(n_(2)))=10/((3xx10^(8))/1.5)`
`=1/2xx 10^(-7) =5xx10^(-8)`
t=50 ns
`t=5xx10^(-8)`
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