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JEE Main & Advanced Physics Ray Optics Sample Paper Topic Test - Reflection of Light

  • question_answer
    A dentist wants a small mirror that when placed 2 cm from a tooth, will produce \[3\times \] upright image. What kind of mirror must be used and what must its focal length be?

    A) concave mirror, 3.0 cm

    B) concave mirror, 1.5 cm

    C) convex mirror, 3.0 cm

    D) convex mirror, 1.5 cm

    Correct Answer: A

    Solution :

    [a] \[m=+\frac{v}{u}=\frac{+f}{u-f}\]             \[3=\frac{+f}{+2+f}\Rightarrow f=3cm\]


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