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Fig, here shows P and Q as two equally i...

Fig, here shows P and Q as two equally intense coherent sources emitting radiations of wavelength 20m. The separation PQ si 5m, and phase of P is ahead of the phase Q by `90^(@)`. A, B and C are three distant points of observation equidistant from the mid - point of PQ. The intensity of radiations of A, B, C will be in the ratio

A

Option1 `0:1:4`

B

Option2 `2:1:0`

C

Option3 `0:1:2`

D

Option4 `4:1:0`

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