Q.

Light waves of wave length λ propagate in a medium. If  M and N are two points on the wave front and they are separated by a distance λ/4, the phase difference between them will be (in radian)

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a

π4

b

zero

c

π8

d

π2

answer is D.

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Detailed Solution

As the M and N are two points on the same wave front, the phase difference between them is zero. From Huygen’s principle they are in phase.

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