Question

An extended object is placed at a distance of 5cm from a convex lens of focal length 8cm . Find the position of image from lens formula

Answer 1

Given,

Object distance, (u) = 5.0 cm

Focal length (f) of convex lens = 8.0 cm

Using lens formula:

1/v-1/u=1/f

Where v is the image distance,

on putting the given values we get:

1/v-1/5 = 1/8

⇒1/v = 1/8-1/5

⇒1/v = -3/40

∴ v = -13.3 cm

Hence, the position of the image from the lens is 13.3 cm.