Question

if an object is placed at a distance of 50 cm from a concave lens of focal length 20 cm find the position nature and height of the image​

Answer 1

object distance u=-50cm, focal length of concave lens f=-20cm.

Lens formula:

1/v-1/u =1/f 1/v=1/f+1/u

1/(-20)+1/(-50)=-7/100

v=-100/ 7=-1.43cm

m=v/u=-1.43/(-50)=0.286