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in YDSE intensity of light emerging from each slit is $I_{0}$ . If the slits behave like incoherent sources of light, intensity of at the mid point of the screen is $I_{1}$ and if the slits behave like coherent sources of light, intensity at the mid point of the screen is found to be $I_{2}$ . Then $I_{1} / I_{2}$ is

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$\frac{1}{4}$

$\frac{1}{2}$

answer is C.

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Detailed Solution

For incoherent sources, $I_{1} = I_{0} + I_{0} = 2 I_{0}$

For coherent sources, $I_{2} = 4 I_{0}$

$∴ \frac{I_{1}}{I_{2}} = \frac{2 I_{0}}{4 I_{0}} = \frac{1}{2}$

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