Q. A convex lens of focal length 20 cm has power

20 सेमी फोकस दूरी के एक उत्तल लेंस में शक्ति है

A

2D
2डी

B

+5D
+5डी

C

-5D
-5डी

D

-2D
-2डी

Explanation

Power $P = \frac{100}{f (in cm)}$ Here, $f = +20 \text{ cm}$ (positive for convex lens)

P = \frac{100}{20} = +5D

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