Question

88. A lens produces a virtual image of size 2/3 that of the
object placed at 20 cm from the lens. Find the position
of the image, nature and focal length of the lens.​

Answer 1

Answer:

f=-40

lens= concave lens

Explanation:

u=-20. m=2/3

v=? lens=? f=?

m=v/u

2/3=v/-20

-40/3=v

-13.3=v

f=1/v-1/u

=3/-40-1/-20

=-1/40

f=-40

lens= concave lens

hope it will help you

Answer 2

Answer:

samaj nhi aa rha ha ma Abhi chota hu