A person has a minimum distance of distinct vision as 50cm. The power of lenses required to read a book at a distance of 25cm is

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A person has a minimum distance of distinct vision as 50cm. The power of lenses required to read a book at a distance of 25cm is
A. 3 D
B. 1 D
C. 2 D
D. 4 D

by (96.2k points)
Using, P=(1)/(f)
We get, P=2 D