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JEE Main & Advanced Sample Paper JEE Main Sample Paper-16

  • 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 :

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


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