Interference of Light Young Experiment

In the year 1802, Young demonstrated the experiment on the interference of light. He allowed sunlight to fall on a pinhole S and then at some distance away on two pinholes A and B.

A and B are equidistant from S and are close to each other. Spherical waves spread out from S. Spherical waves are also spread out from A and B. These waves are of the same amplitude and wavelength. On the screen interference hands are produced which are alternatively dark and bright. The points such as E are bright because the crest due to one wave coincide with the crest due to the other and therefore they reinforce each other. The points such as F are dark because the crest of one falls on the trough of the other and they neutralize the effect of each other. Points similar to E, where the trough of one falls on the trough of the other, are also bright because the two waves reinforce.

It is not possible to show interference due to two independent sources of light because a large number of difficulties are involved. The two sources may emit light waves of largely different amplitude and wavelength and the phase difference between the two may change with time.

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