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    Combination lens and double slit interference

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    A source of monochromatic light with wavelength lambda is located on optical (principal) axis on distance p from converging lens, which consist of two pieces of different glass as shown in the figure. Parallel to the lens axis screen is D away from it (D>>p). Define lens focal length f and derive the expression for estimating the order of the bright fringes that can be expected on the screen at point A.

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    Following is the text part of the solution. Please see the attached file for complete solution. Equations, diagrams, graphs and special characters will not appear correctly here.


    Every thing is similar to what we did in the earlier problem. Only difference is that the focal length f needs to be found for the combination lens.

    Let f1 and f2 be the focal lengths of the two lenses with refractive indices n1 and n2 respectively.

    Using Lensmaker's equation 1/f = (n-1)[1/R1 - 1/ R2]

    1/f1 = (n1 - 1) [1/R - 1/r]
    1/f2 = (n2 - ...

    Solution Summary

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