Figure here shows P and Q as two equally intense coherent sources emitting radiations of wavelength 20 m. The separation PQ is 5.0 m and phase of P is ahead of the phase of Q by 90o. A, B and C are three distant points of observation equidistant from the mid-point of PQ. The intensity of radiations at A, B, C will bear the ratio [NSEP 1994]

Figure here shows P and Q as two equally intense coherent sources emit

1.	Figure here shows P and Q as two equally intense coherent sources emitting radiations of wavelength 20 m. The separation PQ is 5.0 m and phase of P is ahead of the phase of Q by 90o. A, B and C are three distant points of observation equidistant from the mid-point of PQ. The intensity of radiations at A, B, C will bear the ratio [NSEP 1994]
A.	0 : 1 : 4
B.	4 : 1 : 0
C.	Diffraction
D.	2 : 1 : 0
Answer» E.

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