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

  • question_answer
    An object is placed at a distance of 20 cm from a convex lens of focal length 10 cm. The image is formed on the other side of the lens at a distance                                [CPMT 1971; RPET 2003]

    A)            20 cm                                      

    B)            10 cm

    C)            40 cm                                      

    D)            30 cm

    Correct Answer: A

    Solution :

                       \[\frac{1}{f}=\frac{1}{v}-\frac{1}{u}\] (Given \[u=-20\]cm, \[f=10\]cm, \[v=?\])            \[\therefore \] \[\frac{1}{10}=\frac{1}{v}-\frac{1}{(-20)}\Rightarrow v=20\,cm\]


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