In the experiment to trace the path of a ray of light through a rectangular glass slab using pins P1, P2, P3 and P4, four students did the following:

A: looked at heads of P1 and P2 while placing P3, and heads of P1, P2 and P3 while placing P4.

B: looked at feet of P1 and P2 while placing P3, and feet of P1, P2 and P3 while placing P4.

C: looked at heads of P1 and P2 while placing P3, and feet of all the pins while placing P4.

D: looked at feet of P1 and P2 while placing P3, and heads of all the pins while placing P4.

The correct procedure is that of student:

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answer is B.

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Detailed Solution

The correct procedure to trace the path of a ray of light through a rectangular glass slab using four pins is to look at feet of P1 and P2 while placing P3, and feet of P1, P2 and P3 while placing P4.
While performing this experiment, the pins P1 and P2 should not be placed too close to each other. Otherwise, it would be really difficult to align the light passing through them when seen from another side of the slab. And from the other side, we need to focus on the feet of the pins and then give points that are in line with those two pins.

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