Question

An object of height 3cm is placed on the principal axis at a distance
of 40cm from a convex lens of focal length 20cm.find the image distance and height of the image.write the characteristics of the image. ​

Answer 1

Answer:

the image distance is 40 cm and height is 3 cm only. the image is real inverted and formed at the other centre of curvature

Explanation:

here the focal length is 20 cm . we know that radius of curvature=2 times the focal length

so here the object distance is equal to radius of curvature . hence we can say that the object is on centre of curvature.

Answer 2

Answer:

the image distance is 40 cm and height is 3 cm only the image is real inverted and formed at the other centre of curvature