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State PCS PYQPrelims 2022

BPSC – Combined Competitive Examination · Question 91

What type of lens is used in a magnifying glass?

  1. Plano-concave
  2. Convex lens
  3. Convex mirror
  4. Concave lens
  5. None of the above / More than one of the above
Show answer & explanation

Answer: (B) Convex lens

Explanation

A simple magnifier is a convex lens held so the object is within its focal length.

  • (A) Incorrect

    Wrong: concave lenses diminish.

  • (B) Correct

    Correct: a convex lens gives a magnified virtual image when the object is within focus.

  • (C) Incorrect

    Wrong: a mirror, not a lens.

  • (D) Incorrect

    Wrong: diminishes images.

  • (E) Incorrect

    Wrong: only one of the options A–D is correct.