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

  • question_answer
    A double convex lens of glass of m = 1.5 has radius of curvature of each of its surface is 0.2 m.  The power of the lens is                                                                [JIPMER 1999]                            

    A) + 10 dioptres                        

    B) - 10 dioptres

    C) - 5 dioptres                          

    D)   +5 dioptres

    Correct Answer: D

    Solution :

    \[f=\frac{R}{2(\mu -1)}\]\[\Rightarrow P=\frac{2(\mu -1)}{R}=\frac{2(1.5-1)}{0.2}=+\,5\,D\]


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