The core material of an optical fibre has a refractive index of 1.654 while the cladding material has refractive index of 1.645. Find the value of the critical angle in the core material.

The core material of an optical fibre has a refractive index of 1.654

1.	The core material of an optical fibre has a refractive index of 1.654 while the cladding material has refractive index of 1.645. Find the value of the critical angle in the core material.
Answer» Solution :Refractive INDEX of CORE MATERIAL, `muunderset1` = 1.654 Refractive index of cladding material, `muunderset2`=1.654 `thereforesin iundersetc` = muunderset2/muunderset1 = .645/1.654=0.9946 `thereforeiundersetc =sin^-1(0.9946)=84^@`

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The core material of an optical fibre has a refractive index of 1.654 while the cladding material has refractive index of 1.645. Find the value of the critical angle in the core material.

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