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

  • question_answer
    In a plano-convex lens the radius of curvature of the convex lens is 10 cm.  If the plane side is polished, then the focal length will be (Refractive index = 1.5)  [CBSE PMT 2000; BHU 2004]

    A)            10.5 cm                                   

    B)            10 cm

    C)            5.5 cm                                     

    D)            5 cm

    Correct Answer: B

    Solution :

               \[f=\frac{R}{2(\mu -1)}=\frac{10}{2(1.5-1)}=10\,cm\]


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