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प्रश्न
Why two light sources must be of equal intensity to obtain a well-defined interference pattern?
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उत्तर
This is because, only if the intensities of two light sources are equal, the intensity of dark fringes (destructive interference) is zero and the contrast between bright and dark fringes will be maximum, thereby giving rise to the well-defined interference pattern.
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`[sin 45^circ = cos 45^circ = 1/sqrt 2]`
