Power of a lens of focal length 25 cm is
[amp_mcq option1=”+2-5 Dioptre” option2=”+3 Dioptre” option3=”+4 Dioptre” option4=”+5 Dioptre” correct=”option3″]
This question was previously asked in
UPSC NDA-2 – 2021
Power P = 1 / 0.25 m = 1 / (1/4) m = 4 Dioptre (D).
A positive power indicates a converging (convex) lens.