Two statements are given below.
Statement I If the phase difference between the two sources varies continuously, then interference pattern disappears.
Statement II If two slits in Young's double slit experiment are illuminated by two different lamps emitting light of the same wavelength, then no interference pattern will be observed.
In the light of above statements, choose the most appropriate answer from the options given below.
Text Solution
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When the phase difference between the two sources varies continuously, then positions of bright and dark fringes will change rapidly. Such rapid changes cannot be detected by our eyes. Thus, a uniform illumination is seen on the screen, i.e., interference pattern disappears. Hence, Statement I is correct.
The light waves emitted by two different lamps cannot be coherent. So the conditions of maxima and minima of intensity will change rapidly on the screen, producing uniform illumination and thus, no interference pattern will be observed. Hence, Statement II is also correct.
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