Question

an object is placed at 5 cm from a convex lens of focal length of a convex lens is 20 CM then find the position and nature of the image​

Answer 1

Answer:

Given: u=20

f=5

v=?

by lens formula

1/f = 1/v - 1/u

1/5 = 1/v - (-1)/5

1/v = 2-1/5

v= 5

magnification = -v/u

= 5/20

= -4

nature = real