If the power of lens is +5D, then its focal length is ____ .
A. 50
B. 20
C. 25
D. 33
Answer: Option B
Solution (By Examveda Team)
Power of a lens is determined by the formula P=1/f (when focal length is in meters) and P=100/f (when focal length is in centimeters) Here,the power is given as 5 diopters. On equating we get, ⇒5=100/f ⇒f=100/5 =20 cms.This Question Belongs to User Ask Question >> Miscellaneous
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