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

  • question_answer
    Two similar plano-convex lenses are combined together in three different ways as shown in the adjoining figure. The ratio of the focal lengths in three cases will be

    A)            2 : 2 : 1                                    

    B)            1 : 1 : 1

    C)            1 : 2 : 2                                    

    D)            2 : 1 : 1

    Correct Answer: B

    Solution :

               In each case two plane-convex lens are placed close to each other, and \[\frac{1}{F}=\frac{1}{{{f}_{1}}}+\frac{1}{{{f}_{2}}}\].


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