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Question

The phases of the light wave at c, d, e and f are ϕc, ϕd, ϕe and ϕf respectively. It is given that ϕcϕf

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A
ϕc cannot be equal to ϕd
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B
ϕd can be equal to ϕe
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C
(ϕdϕf) is equal to (ϕcϕe)
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D
(ϕdϕc) is not equal to (ϕfϕe)
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Solution

The correct option is C (ϕdϕf) is equal to (ϕcϕe)
Since phases in a single wave front is same everywhere,
ϕc=ϕd
and ϕe=ϕf
It is given that ϕcϕf
ϕdϕe
and (ϕdϕf)=(ϕcϕe)

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