Which of the following can make a parallel beam of light when light from a point source is incident on it? 

(A) Concave mirror as well as convex lens. 

(B) Convex mirror as well as concave lens. 

(C) Two plane mirrors placed at 90° to each others. 

(D) Concave mirror as well as concave lens. 

 

Answer - 

Only converging lens and converging mirror can make a parallel beam of light incident on a point.

  • Concave mirror is a converging mirror.
  • Convex lenses converge to light rays, hence convex lenses are also called converging lenses .

convex-lens-object-at-infinity---ray-diagram---teachoo.jpg

 

 

concave-mirror---object-at-infinity---ray-diagaram---teachoo.jpg

So, the correct answer is (a) - Concave mirror as well as convex lens. 

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About the Author

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CA Maninder Singh
CA Maninder Singh is a Chartered Accountant for the past 11 years and a teacher from the past 11 years. He teaches Science, Accounts and English at Teachoo