Question

state two conditions for no change in direction of light ray on refraction​

Answer 1

Answer:

when refractive index of both the medium is same 2.. when incident ray makes 0 degree

Answer 2

Answer:

The conditions for no change in direction of light ray on reflection are :

1) When the incident ray makes an angle of 90° with the interface.

2) When the refractive index of both the medium is equal.

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