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In the figure shown, a parallel beam of ...

In the figure shown, a parallel beam of light is incident on the plane of the slits of a Young's double slit experiment. Light incident on the slit `S_(1)` passes through a medium of variable refractive index `mu=1+ax`(where'x' is the distance from the the plane of slits as shown ), upto a distance 'l' before falling on `S_(1)`. Rest of the speace is filled with air. If at O a minima is formed, then the minimum value of the positive constant a ( in term of l and wavelength `'lambda'` in air ) is:

A

`(lambda)/(l)`

B

`(lambda)/(l^(2))`

C

`(l^(2))/(lambda)`

D

None of these

Text Solution

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The correct Answer is:
B
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