Study the following four experimental set-ups I, II, III, and IV for the experiment, "To trace the path of a ray of light through a rectangular glass slab." Which of the marked set-ups is likely to give the best results ( $P_{1}$ and $P_{2}$ are the positions of pins fixed on the incident ray)?

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III

answer is D.

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Detailed Solution

The pins shouldn't be too close to one another since when viewed from the opposite side of the slab, it would be difficult to align the light travelling through both of them. III is therefore rejected.
In order to obtain information regarding the refractive index, the incident light ray must not be normal to the surface of the glass slab. Therefore, I is rejected.
Additionally, the angle of incidence needs to be ideal to see the light's changed course after it emerges from the other side of the slab.
A wide angle of incidence can produce subpar outcomes. II is therefore rejected.

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