[Shy girl 1991]

An object is placed in front of a convergent lens at the distance of 40.0 cm. Find (a) distance between the image and the lens (b) lateral magnification if the focal distance of the lens is 20.0 cm

الحل:
1%p+1%q=1%f
1%q=1%f-1%p=1%20-1%40=1%40
q=40%1=40 cm

M=-q%p=-40%40=1

ابي شرح للحل