You wish to create a fiber optic cable out of two materials, with one forming th

Question

You wish to create a fiber optic cable out of two materials, with one forming the inner cable and one the outer coating (cladding). To make the best cable which would you use as the inner material and which would you use for the cladding?

X: n = 1.2
Y: n = 1.5
Z: n = 1.8

(Assume all other properties are identical.)

A. Z as the inner material, X as the cladding
B. Y as the inner material, X as the cladding
C. Z as the inner material, Y as the cladding
D. X as the inner material, Y as the cladding
E. X as the inner material, Z as the cladding
F. Y as the inner material, Z as the cladding

Please provide answer AND reasoning! Thank you!

Explanation / Answer

We know that the total internal reflection takes place while ligth travelling from denser to rare medium only

in optical fiber cable the the inner core is of rare medium with less refractive index and cladding is outer with less refractive index

we know that the less refractive index is treated as rarer medium and higher refractive index is denser medium

here given refractive indicies are

X: n = 1.2

Y: n = 1.5

Z: n = 1.8

so from thegiven options  

D,E,F are correct.

D . X as the inner material, Y as the cladding

X is rarer and Y is denser

E. X as the inner material, Z as the cladding

X is rarer and Z is denser

F. Y as the inner material, Z as the cladding

y is rarer and Z is denser

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