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

  • question_answer
    A thin double convex lens has radii of curvature each of magnitude 40 cm and is made of glass with refractive index 1.65. Its focal length is nearly                                               [MP PMT 1997]

    A)            20 cm                                      

    B)            31 cm

    C)            35 cm                                      

    D)            50 cm

    Correct Answer: B

    Solution :

               \[f=\frac{R}{2(\mu -1)}\Rightarrow f=\frac{40}{2(1.65-1)}\approx 31\]cm


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