Question

objects of height 4 cm is placed at a distance of 30 cm from the optical centre O of a convex lens of focal length 20 cm bra read diagram to find the position and size of the image phone mark optical centre O and print principal focus F on the diagram also find the approximate ratio of size of the image to the size of the object

Answer 1

the magnification is 2x i.e. the height of the image is 8 cm

Answer 2

The image will be formed after 2f.,it is enlarged or magnified.