Question

a convex lens produces an image of an object on a screen with a magnification of 1/2.When the lens is moved 30 cm away from the object , the magnification of the image is 2.The Focal length of the lens is

1) 20 cm
2) 25 cm
3) 30 cm
4) 35 cm

Answer 1

Answer:

3-30 cm fzgushsvdushs

Answer 2

Answer:

find answer in doubtnut