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

  • question_answer
    The combination of a convex lens (f = 18 cm) and a thin concave lens (f = 9 cm) is                              [AMU (Engg.) 2001]

    A)            A concave lens (f = 18 cm)     

    B)            A convex lens (f = 18 cm)

    C)            A convex lens (f = 6 cm)  

    D)            A concave lens (f = 6 cm)

    Correct Answer: A

    Solution :

               \[\frac{1}{F}=\frac{1}{+18}+\frac{1}{(-\,9)}\Rightarrow F=-\,18\]cm (i.e. concave lens)


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