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Which of the following statements is true? (a) A convex lens has 4 dioptre power having a focal length 0.25 m (b) A convex lens has –4 dioptre power having a focal length 0.25 m (c) A concave lens has 4 dioptre power having a focal length 0.25 m A concave lens has –4 dioptre power having a focal length 0.25 m

ScienceClass 10CBSEAnswered 27 Mar 2026
Answer
  • Soln:

Answer is (a) A convex lens has 4 dioptre power having a focal length 0.25 m

Explanation:

Positive value for focal length indicates convex lens.

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