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Two beam of light having intensities $I$ and $4I$ interfere to produce a fringe pattern on a screen . The phase difference between beams is $ \large\frac{\pi}{2}$ at point A and n at point B. Then the difference between resultant intensities at A and B is

$(a)\;2I \\ (b)\;4I \\ (c)\;5I \\ (d)\;7I $

1 Answer

$I_R= I+ 4I+2 (I.4I)^{1/2} \cos \phi$
At $ A, \phi =\large\frac{\pi}{2}$$ => I_A=5I$
At $B, \phi= \pi$
Hence b is the correct answer.


answered Feb 19, 2014 by meena.p
edited Jul 23, 2014 by thagee.vedartham

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