Question

An object of height 5cm placed perpendicular to the principal axis of a a

lens of focal length 20cm forms a virtual image magnified 2 times. Find

a) The image distance

b) The size of the image and

c) The type of lens. (3 marks) ​

Answer 1

Answer:

f the distance of the object from the optical centre of the lens is 20 cm, ... Focal length of the concave lens = f = −10 cm ... Because v is negative, we can say that the image is virtual.