Question

an object is placed at a distance of 10cm from convex lens whose focal length is 20cm Find the position and nature of image​

Answer 1

Nature of the image: The image is formed behind the mirror and it is virtual and erect. and erect.

Explanation:

Given:u=−10cm f=20cm (convex lens)

To find: v and image's nature.

Solution: From lens formula

v

1

−

u

1

=

f

1

v

1

+

10

1

=

20

1

v

1

=

20

−1

v=−20cm

And magnification =

u

v

=2

Hence image formed is virtual, erect and magnified two times.