In the glass slab experiment shown below, four students A, B, C and D did the following:

A: kept the eyes far from the glass slab while placing both the pins P3 and P4.

B: kept the eyes close to the glass slab while placing both the pins P3 and P4.

C: kept the eyes close to the glass slab while placing pin P3 and far from the slab while placing pin P4.

D: kept the eyes far from the glass slab while placing pin P3 and close to the slab while placing pin P4.

The correct procedure is that of student:

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answer is A.

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Detailed Solution

In the above experiment the student A followed the correct procedure.
While doing this experiment, we must keep our eyes far from the slab. Because if we keep our eyes closed to the glass slab, everything will appear blurry, and we will not get the desired result. There is a minimal range of distance where the eyes should be kept, neither too far nor too close.

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