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Two points nonochromatic and coherent so...

Two points nonochromatic and coherent sources of light of wavelength `lambda` each are placed as shown in figure. The initial phase difference between the sources is zero O. `(d gt gt d)`. Mark the correct statement(s).

A

If `d=(7lambda)/(2),O` will be minima.

B

If `d=lambda`, only one maxima can be observed on screen.

C

If `d=4.8lambda` then total 10 minimas would be there on screen.

D

If `d=(5lambda)/(2)`, then intensity at O would be maximum.

Text Solution

Verified by Experts

The correct Answer is:
D
Path difference, ` triangle x" at "O=d.`
So, if `d=(7lambda)/(2),O` will be a minima.
If `d=lambda,O` will be maxima.
If `d=(5lambda)/(2),O` will be minima and hence intensity is minimum.
If `d=4.8lambda,` then total 10 minimas can be observed on screen, 5 above and 5 below O, which correspond to
` triangle x=+-(lambda)/(2),+-(3lambda)/(2),+-(5lambda)/(2),+-(7lambda)/(2),+-(9lambda)/(2)`
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