Physics-
General
Easy
Question
In the figure shown, a parallel beam of light is incident on the plane of the slits of Young's double slit experiment. Light incident on the slit, 
passes through a medium of variable refractive index 
(where 'X' is the distance from the plane of slits as shown), up to a distance '
' before falling on . Rest of the space is filled with air. If at 'O' a minima is formed, then the minimum value of the positive constant a (in terms of l and wavelength '' in air) is:
- None of these
The correct answer is:
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