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

  • question_answer
    The focal lengths of convex lens for red and blue light are 100 cm and 96.8 cm respectively. The dispersive power of material of lens is                                                        [Pb. PET 2003]

    A)            0.325                                       

    B)            0.0325

    C)            0.98                                          

    D)            0.968

    Correct Answer: B

    Solution :

                       \[\omega =\frac{{{f}_{R}}-{{f}_{V}}}{{{f}_{y}}}=\frac{{{f}_{R}}-{{f}_{V}}}{\sqrt{{{f}_{V}}{{f}_{R}}}}\] Putting value of \[{{f}_{V}}\] and \[{{f}_{R}}\] we get \[\omega =0.0325\].


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