railway RRB JE (CBT I + CBT II) Mock Test 2024 Physics Optics Refraction and Reflection

If μ1 is the refractive index of core and μ2 is the refractive index of cladding, then correct relation for the propagation of light in fibre is:

1
μ1 > μ2
2
μ1 ≥ μ2
3
μ1 < μ2
4
μ1 ≤ μ2
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