(a) Light waves from two cohernet sources having intensities I and 2I cross each other at a point with a phase difference of 60^@. What is the resultant intensity at the point ? (b) With the help of a diagram obtain an expression for finding the distance between two consecutive bright or dark fringes in the interference pattern prodcued by double-slits.

(a) Light waves from two cohernet sources having intensities I and 2I

1.	(a) Light waves from two cohernet sources having intensities I and 2I cross each other at a point with a phase difference of 60^@. What is the resultant intensity at the point ? (b) With the help of a diagram obtain an expression for finding the distance between two consecutive bright or dark fringes in the interference pattern prodcued by double-slits.
Answer» Solution :(a) LET `I_1 = I, I_2 = 2I` Resultant INTENSITY= `I_1 + I_2 + 2sqrt(I_1) sqrt(I_2) cos 60^@` `= I + 2I + 2sqrt(I cdot 2I) XX 1/2` `= 4.414 I`

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