Please tell LIGHT Share with your friends Share 0 Rohit Babu answered this Dear Student,(There is a mistake in the question.The object distance is given as u=-20cm. So I am assuming we need to find the image distance v.)Given,u=-20cm, v=?, f=-20cm (focal length is negative for concave mirror)For virtual image magnification is positive.⇒m=+2⇒m=-vu=+2 or, v=-2u=-2×-20=+40cmIf u was not given,we can find the object distance as..-vu=2v=-2u1f=1u+1v⇒-120=1u-12u=2-12u=12u⇒-120=12u2u=-20u=-10cmRegards. 1 View Full Answer Malkit_singh _khalsa** answered this Hy sure waiy 0