SSC General Science & Technology Sample Paper NCERT Sample Paper-3

  • question_answer
    A dentist's mirror is a:

    A)  Convex mirror

    B)  cylindrical mirror

    C)  Plane mirror     

    D)  concave mirror

    Correct Answer: D

    Solution :

    [d] Concave mirrors are used by dentists because at a short range (object distances less than the focal length) they produce magnified, upright images. It is useful to have a magnified image of a tooth when you're looking for or repairing cavities, cracks, or other abnormalities.

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