Question

an object is placed at a distance of 45 cm in front of a convex lens having focal length 15 cm. find the position of image?

Answer 1

object distance=-45cm=u

focal length=15cm

image distance=v=?

Now,

From lens formula:1/v-1/u=1/f

1/v-1/(-45) =1/15

1/v=-1/45+1/15

$\frac{1}{v} = \frac{ - 1 + 3}{45}$

1/v=2/45

Therefore,v=22.5cm