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An inteference is observed due to two co...

An inteference is observed due to two coherent sources A and B separated by a distance `4lambda` along Y-axis, where `lambda` is the wavelength of light. A detector 'D' is moved alog the positive X-axis. Find the totla number of maxima observe on the X-axis excluding the points `x =0` and `x = oo` ?

A

three

B

four

C

two

D

infinite

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A
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