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JEE Main & Advanced Physics Ray Optics Question Bank Mock Test - Geometrical Optics

  • question_answer
    A convex lens of focal length 20 cm and a concave lens of focal length\[f\]are mounted coaxially 5 cm apart. Parallel beam of light incident on the convex lens emerges from the concave lens as a parallel beam. Then, \[f\] (in cm) is

    Answer:

    15


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