In the figure shown, 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 plane os lits as shown), upto a distance 'l' before falling on S_(1). 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 'lambda' in ) is :

In the figure shown, parallel beam of light is incident on the plane o

1.	In the figure shown, 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 plane os lits as shown), upto a distance 'l' before falling on S_(1). 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 'lambda' in ) is :
Answer» `(lambda)/(L)` `(lambda)/(l^(2))` `(l^(2))/(lambda)` None of these Answer :B

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