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

  • question_answer
    A concave lens of focal length 20 cm placed in contact with a plane mirror acts as a                                           [SCRA 1998]

    A)            Convex mirror of focal length 10 cm

    B)            Concave mirror of focal length 40 cm

    C)            Concave mirror of focal length 60 cm

    D)            Concave mirror of focal length 10 cm

    Correct Answer: A

    Solution :

               \[\frac{1}{F}=\frac{2}{f}+\frac{1}{{{f}_{m}}}\]. Here \[{{f}_{m}}=\infty \], hence \[F=\frac{f}{2}=10\,cm\]


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