Two coherent plane light waves of equal amplitude makes a small angle a (« 1) with each other. They fall almost normally on a screen. |
If \[\lambda \] the wavelength of light waves, the fringe width \[\Delta x\]of interference patterns of the two sets of waves on the screen is [JEE ONLINE 19-05-2012] |
A) \[\frac{2\lambda }{\alpha }\]
B) \[\frac{\lambda }{\alpha }\]
C) \[\frac{\lambda }{\left( 2\alpha \right)}\]
D) \[\frac{\lambda }{\sqrt{\alpha }}\]
Correct Answer: C
Solution :
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