engineering recuitment BEL Probationary Engineers Mock Test 2025 Electronic Mechanic Communications and Radio Transmission Fibre-Optic Communications
What is the refractive index of the incident medium in a fibre-optic cable when the reflective index of reflective medium is 1.2 and critical angle is 30 degree?
1
0.6
2
1
3
1.5
4
2.4