Question

In an experiment to trace the path of a ray [Fig.] of of light passing through a rectangular glass slab, the correct measurement of angles of incidence (i), refraction (r) and emergence (e) is shown in figure:

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Answer 1

Explanation:

The angles of incidence \(i\), refraction \(r\), and emergence \(e\) are always measured with respect to the normal at the point of incidence.

For a rectangular glass slab:

\[ i > r \]

because the ray bends towards the normal on entering glass, and

\[ e = i \]

because the emergent ray is parallel to the incident ray.