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

  • question_answer
    Focal length of a convex lens will be maximum for [MP PMT 1994]

    A)            Blue light                               

    B)            Yellow light

    C)            Green light                           

    D)            Red light

    Correct Answer: D

    Solution :

               \[f\propto \frac{1}{(\mu -1)}\] and \[\mu \propto \frac{1}{\lambda }\]. Hence \[f\propto \lambda \] and \[{{\lambda }_{r}}>{{\lambda }_{v}}\]


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