A convex lens of focal length f forms an image which is 13/ times the size of the object. Then, the distance of object from the lends is
A convex lens of focal length f forms an image which is 13/ times the size of the object. Then, the distance of object from the lends is
A. 2f
B. f
C. `(2)/(3)f`
D. `(3)/(2)f`
4 views
1 Answers
Correct Answer - A
Given `f=-f Rightarrow v=(1)/(3)u`
According to the lens formula,
`(1)/(f)=(1)/(v)-(1)/(u)-(1)/(f)=(1)/((-1//2)u)+(1)/(u)-(1)/(f)`
`(-3+1)/(u)-(1)/(f)=-(2)/(u) Rightarrow u=2f`
4 views
Answered