Question

Find position size and nature of the image formed by a convex lens of focal length 20cm if size of the image is equal to the size of the object

Answer 1

Answer:

The image will be real, inverted and will be formed 40cm on opposite side of lens and image size will be 40cm

Explanation:

the image size= object size

image distance = object distance

focal length =20cm

thus putting values in 1/u+1/v=1/f,

1/v +1/v=1/20

or, 2/v=1/20

or, v=40

the image distance =40cm =2 focal length