In Young's double slit experiment, the two slits act as coherent sources of equal amplitude A and of wavelength λ in another experiment with the same set up, the two slits are sources of equal amplitude A and wavelength λ but are incoherent. The ratio of the intensity of light at the midpoint of the screen in the first case of that in the second case is

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In Young's double slit experiment, the two slits act as coherent sources of equal amplitude A and of wavelength λ in another   experiment with the same set up, the two slits are sources of equal amplitude A and wavelength λ  but are incoherent. The ratio of the intensity of light at the midpoint of the screen in the first case of that in the second case is

Infinity Learn · Accepted Answer

when the tow sources are coherent. then amplitude at $$mid-point$$ $$=$$ $$A+$$ A $$=$$ $$2A$$ $$I1$$∝$$(2A)2$$  or  $$I1=k$$×$$4A2$$ When the two sources are incoherent, $$thenI2$$∝$$A2+A2$$  or  $$I2=k$$×$$2A2$$ $$I1I2=k$$×$$4A2k$$×$$2A2=2$$

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