a step index fiber has a solid acceptance angle in air of 0.115 radians relative refractive...
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EXPLANATION
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Given:
Solid acceptance angle in air=0.115 radians
Relative refractive index (n)=0.9
Assume speed of light in vaccum(c)=3.00x108 m/s
Formula: v=c/n
v=speed of light in fiber
c=speed of light in vaccum
n=relative refractive index
v=3.00x108 /0.9 =3.3x108 m/s
Thus speed of light in fiber core is 3.3x108 m/s
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