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

  • question_answer
    A beam of parallel rays is brought to a focus by a plano-convex lens. A thin concave lens of the same focal length is joined to the first lens. The effect of this is                       [KCET 2004]

    A)            The focal point shifts away from the lens by a small distance

    B)            The focus remains undisturbed

    C)            The focus shifts to infinity

    D)            The focal point shifts towards the lens by a small distance

    Correct Answer: C

    Solution :

               \[\frac{1}{F}=\frac{1}{{{f}_{1}}}+\frac{1}{{{f}_{2}}}\]


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