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JEE Main & Advanced Physics Ray Optics Question Bank Refraction at Curved Surface

  • question_answer
    A achromatic combination is made with a lens of focal length \[f\] and dispersive power \[\omega \] with a lens having dispersive power of \[2\omega \]. The focal length of second will be [RPET 1997]

    A)            2 f  

    B)            \[f/2\]

    C)            \[-f/2\]                                   

    D)            ? 2 f

    Correct Answer: D

    Solution :

               \[\omega /f=-2\omega /f'\Rightarrow f'=-2f\]


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