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Four monochromatic and coherent sources of light, emitting waves in phase of wavelength `lambda`, are placed at the points x = 0, d 2d and 3d on the x-axis. Then

A

points having `|x| gt gt d` appear dark if d = `lambda//4`

B

points having `|x| gt gt d` appear dark if d = `lambda//8`

C

points having `|x | gt gt d` appear maximum beight if `d = lambda //4`

D

points having `|x| gt gt d ` appear maximum bright if `d = lambda//8`

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The correct Answer is:
A
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