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NTSE Sample Paper NTSE SAT Practice Test-10

  • question_answer
    Which of the following lenses, would you prefer to use while reading small letters found in a dictionary?

    A) A convex lens of focal length 50 cm.

    B) A concave lens of focal length 50cm.

    C) A convex lens of focal length 5 cm.

    D) A concave lens of focal length 5 cm.

    Correct Answer: C

    Solution :

    [c] A convex lens is used as a magnifying glass. The magnification of a lens, \[M\propto \frac{1}{f}.\] So, a convex lens of small focal length acts as a magnifying glass.


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