Consider the following statements about inter | vedclass

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(A) In interference,the fringes are equally bright and equally spaced,and the intensity of the bright fringe is four times the intensity of each incid

Vedclass · Accepted Answer

$A$ and $B$ only

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(A) In interference,the fringes are equally bright and equally spaced,and the intensity of the bright fringe is four times the intensity of each incident wave.Resultant intensity at a point is given by $I = I_1 + I_2 + 2\sqrt{I_1}\sqrt{I_2}\cos\delta$,where $I_1$ and $I_2$ are the intensities of the waves from the two sources.For constructive interference,the crest of one wave coincides with the crest of another wave,or the trough coincides with the trough. Statement $C$ is incorrect because the condition described (crest coinciding with trough) leads to destructive interference.For constructive interference at the central maxima,the phase difference $\delta = 0$.If $I_1 = I_2 = I$,then $I_{\max} = I + I + 2\sqrt{I}\sqrt{I}\cos(0) = 4I$.Thus,statements $A$ and $B$ are correct.

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