Question

Define focal length of a spherical lens.
A divergent lens has a focal length of 30 cm. At what distance should an object of height 5
from the optical centre of the lens be placed so that its image is formed 15 cm away from the ler
Find the size of the image also.
Draw a ray diagram to show the formation of image in the above situation.​

Answer 1

Answer:

Focal length of a spherical lens is defined as the distance between optical center and focus of the lens.

Explanation:

Given f= -30 cm; u = ?; h1 = 5 cm; h2= ?,v = -15 cm =2.5 cm