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Light – Reflection and Refraction — Science STD 10 — Question

CBSE BoardEnglish MediumSTD 10ScienceLight – Reflection and Refraction1 Mark
MCQ
Which of the following statements is true?
  • ✓
    A convex lens has $4$ dioptre power having a focal length $0.25m.$
  • B
    A convex lens has $-4$ dioptre power having a focal length $0.25m.$
  • C
    A concave lens has $4$ dioptre power having a focal length $0.25m.$
  • D
    A concave lens has $-4$ dioptre power having a focal length $0.25m.$
✓

Answer

Correct option: A.
A convex lens has $4$ dioptre power having a focal length $0.25m.$
The positive sign with the focal length indicates that it is a convex lens.

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