Two identical monochromatic light sources \( A \) and \( B \) of in...

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Two identical monochromatic light sources \( A \) and \( B \) of intensity \( 10^{-15} \mathrm{~W} / \mathrm{m}^{2} \) produce wavelength of light \( 4000 \sqrt{3} \AA \).
\( \mathrm{P} \) A glass of thickness \( 3 \mathrm{~mm} \) is placed in the path of the ray as

W shown in the figure-6.121. The glass has a variable refractive index \( n=1+\sqrt{x} \) where \( x \) (in mm) is distance of plate from left to right. Calculate resultant intensity at focal point \( F \) of the lens.
Figure \( 6.121 \)
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