Question

find the position , nuture and size of the image formed by a convex lens of focal length 12 cm of an object 5 cm high placed at a distance 20 cm from it​

Answer 1

Answer:

Position of the image-beyond 2f(centre of curvature).

Nature of image-real and inverted.

Size of image,

-1/v-1/u=1/f

-1/v-1/20=-1/12

-1/v=1/20-1/12

-1/v=(3-5)/60

-1/v=-2/60=-1/30

v=30

So magnification=30/20=3/2

So image size=5×3/2=15/2=7.5 cm.