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MODEL PAPER - 1 [2026] — Science STD 10 — Question

CBSE BoardEnglish MediumSTD 10ScienceMODEL PAPER - 1 [2026]1 Mark
MCQ
Which of the following statements is true?
  • A
    A concave lens has 4 dioptre power having
  • B
    A concave lens has-8 dioptre power having a focal length 0.25 m a focal length of 0.25 m
  • C
    A convex lens has -4 dioptre power having a focal length 0.25 m
  • ✓
    A convex lens has 4 dioptre power having a focal length 0.25 m
✓

Answer

Correct option: D.
A convex lens has 4 dioptre power having a focal length 0.25 m
(D) A convex lens has 4 dioptre power having a focal length 0.25 m
Explanation: The power P of a lens of the focal length is given by $P=\frac{1}{f}$, where f is the focal length in meter and power in dioptre $P=\frac{1}{f}$ orf $=\frac{1}{P}=\frac{1}{4}=0.25 \mathrm{~m}$
The positive value for focal length indicates a convex lens.

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