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

  • question_answer
    A convex lens of focal length 25 cm and a concave lens of focal length 10 cm are joined together.  The power of the combination will be                                                  [MP PMT 2001]

    A)            ? 16 D                                      

    B)            + 16 D

    C)            ? 6 D                                        

    D)            + 6 D

    Correct Answer: C

    Solution :

               \[P=\frac{100}{{{f}_{1}}}+\frac{100}{{{f}_{2}}}=\frac{100}{(+25)}+\frac{100}{(-10)}=-\,6D\]


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