Question

in the experiment of refraction through a glass slab the angle of incidence should be less than 90 why​

Answer 1

Answer:

The angle of incidence is nearly equal to the angle of emergence. The angle of refraction is less than the angle of incidence because light is travelling from rarer to the denser optical medium. The lateral displacement remains the same for different angles of incidences.

Explanation:

The refracted light ray either bend towards the normal or away from the normal. If the incident light ray is incident at 90 degrees, this means that it is parallel to the normal and it cannot bend away or towards it. If the light ray doesn't bend then refraction doesn't occur.

Hence, the angle of incidence should be less than 90 degrees to have refraction phenomenon.

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