JEE Main 2012 Physics question
Two coherent plane light waves of equal amplitude makes a small angle α(<< 1) with each other. They fall almost normally on a screen. If λ is the wavelength of light waves, the fringe width Δx of interference patterns of the two sets of waves on the screen is
Answer: (2)
Solution
With the waves inclined at to the normal, the phase difference along the screen grows as ,
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