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Two identical monochromaticlight sources...

Two identical monochromaticlight sources A & B intensity `10^(-15)W//m^(2)` produce wavelength of light `4000sqrt(3)Å` A glass of thickness 3mm is placed in the path of the ray as shown in figure the glass has a varible refractive index `n=1+sqrt(x)` where x (in mm) is distance of plate from left to right calculate total intensity at focal points F of the lens.

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The correct Answer is:
`[4xx10^(-15)W//m^(2)]`
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