While performing the experiment on tracing the path of a ray of light through a rectangular glass slab, in which of the following experimental setups, students likely to get the best results?
$P_{1}$ and $P_{2}$ are the positions of pins fixed by him :

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Solution

The pins must not be too close to each other, otherwise, it would be hard to align the light passing through both of them when seen from the other side of the slab. Hence $I$ and $I V$ are rejected.
Also, the angle of incidence and the distance of the point of incidence from the mid slab must be optimum for observing the shifted path of light after emergence from the other side of the slab. So, $I I$ is rejected.
Hence, the correct answer is option $I I I$ .

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While performing the experiment on tracing the path of a ray of light through a rectangular glass slab, in which of the following experimental setups, students likely to get the best results?P1 and P2 are the positions of pins fixed by him :

While performing the experiment on tracing the path of a ray of light through a rectangular glass slab, in which of the following experimental setups, students likely to get the best results?
$P_{1}$ and $P_{2}$ are the positions of pins fixed by him :