Problema Solution
A lens has a focal length of 6 centimeters. How far is an object from a lens when its image is three times far away?
Answer provided by our tutors
f= 6cm
If the object is x(=p) dist away from the lens then its image is 3x(=i) dist away from lens
As we know
(1/p)+(1/i)=(1/f)
(1/x)+(1/3x)=(1/6)
Solving we get
x=8cm
So object is 8cm apart