An experiment to trace the path of a ray of light through a rectangular glass slab was performed by four students I, II, III, IV. They reported the following measurements of angle of incidence i, angle of refraction r and angle of emergence e. Which one of the students has performed the experiment correctly?

An experiment to trace the path of a ray of light through a rectangula

1.	An experiment to trace the path of a ray of light through a rectangular glass slab was performed by four students I, II, III, IV. They reported the following measurements of angle of incidence i, angle of refraction r and angle of emergence e. Which one of the students has performed the experiment correctly?
Answer» Student I has performed the experiment correctly. This is because +r < +i and +i=+e

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