Question

A convex lens of focal length 0.12m produces an image which is thrice the size of the object. find the distance between the object and the lens. plz don't copy the answers from Google and explain in any page plz

Answer 1

From lens formula

=

1v−

u

1

f

1

v

u

−1=

f

u

v

u

=

f

u+f

u

v

=

u+f

f

For a convex lens f = 0.12m and m=3 then find u

So , 3=

0.12+u

0.12

0.36+3u=0.12

u=−0.08m