A convergent beam of ligh passes through a diverging lens of focal length 0.2 meters comes to focus at a distance 0.3 meters behind the lens find the position of the point at which the beam would converge in the absence of lens?

A convergent beam of ligh passes through a diverging lens of focal len

1.	A convergent beam of ligh passes through a diverging lens of focal length 0.2 meters comes to focus at a distance 0.3 meters behind the lens find the position of the point at which the beam would converge in the absence of lens?
Answer» Solution :F=-0.2m, v=0.3m From the LENS EQUATION 1/f=1/v-1/u 1/u=1/v-1/f=1/0.3-1/-0.2=50/6 U=6/50=0.12m In the absence of lens the beam WOULD converge at a DISTANCE 0.12m from the present position of the lens.