Question

A student does the experiment on tracing the path of a ray of light passing through a rectangular glass slab for different angles of incidence. He can get a correct measure of the angle of incidence and the angle of emergence by following the labelling indicated in figure:

(1 Point)

I

II

III

IV

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Answer 1

Answer:

As the incident ray is parallel to the emergent ray, thus incidence angle is equal to angle of emergence i.e ∠i=∠e

Also the ray travelling from rarer medium (air) to the denser medium (glass slab) slightly bends towards the normal after refraction, thus angle of refraction is smaller than angle of incidence i.e ∠r<∠i

⟹ ∠i=∠e>∠r

Explanation:

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Answer 2

Answer:

As the incident ray is parallel to the emergent ray, thus incidence angle is equal to angle of emergence i.e ∠i=∠e

Also the ray travelling from rarer medium (air) to the denser medium (glass slab) slightly bends towards the normal after refraction, thus angle of refraction is smaller than angle of incidence i.e ∠r<∠i

⟹ ∠i=∠e>∠r