Question

Optical fiber uses reflection to guide light through a channel, in which angle of incidence is ________ the critical angle. (1) equal to (2) less than (3) greater than (4) less than or equal to 31.

Answer 1

Angle of incidence is greater than the critical angle.....

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Answer 2

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Your ans is (3) greater than  

Angle of incidence must be greater than critical angle

If angle is equal or less then critical angle  it will bend along or inside the surface respectively

Optical fiber works on the priciple of Total internal reflection

Total internal reflection is a phenomenon which occurs when a propagating wave strikes a medium boundary at an angle larger than a particular critical angle with respect to the normal to the surface.

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