When a ray of light emerges from a block of glass,the critical angle is
- AEqual to the angle of reflection
- BThe angle between the refracted ray and the normal
- CThe angle of incidence for which the refracted ray travels along the glass-air boundary
- DThe angle of incidence
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Assertion : In optical fibre,the diameter of the core is kept small.
Reason : This smaller diameter of the core ensures that the fibre should have incident angle more than the critical angle required for total internal reflection.
Reason : This smaller diameter of the core ensures that the fibre should have incident angle more than the critical angle required for total internal reflection.
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