Why is the outer layer of optic fibre has refractive index of 1.48 and inner layer has refractive index of 1.5? Why didn't they have anyy other value of refractive index? How is it applicable to total internal reflection?
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2 Answers
62i guess there is no reason... (as far as i understand...)
only a coincidence that the material that is used in fibres has that refractive index!
what we need is that the outer layer should have a lower refractive index so that total internal reflection can take place.....
49yea...the outer layer must have a lower refractive index as compared to the inner layer...but the reason is not so that there can be total internal refraction
but the reason is that when the optical fibres are put in a bunch to form a light pipe, one optical fibre must be insulated from one another ... so a lower RI material is used in outer layer ... to ensure that the light that had escaped from the inner coating are reflected back by the outer coating!! :)
