Q. एक लेंस का फोक्सांतर 25 सेमी. है उसकी क्षमता होगी-

(A) +2D
(B) +4D
(C) -2D
(D) -4D

✅ Correct Answer: (B) +4D

Published by Kanak Sharma ⭐ 6.13K Points at 25-Oct-2021 07:13 am in Physics

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