Question

a convex lens has a focal length of 12cm at which of the following position should the object be placed so the that the convex lens main may act as a magnifying glass​

Answer 1

Answer:

position of object at F OR. position of object b/w F1 and. optical centreb

Explanation:

the image formed highly magnified when object at F

the image formed enlarged when object B/w F1. and O

Answer 2

The object must be between the focal length  and the centre of curvature.

Explanation:

As focal length id 12 cm. So, centre of curvature,

                        length of centre of curvature = 2 x focal length

        So, length of centre of curvature = 24 cm

So, the object is kept between the 12 cm from 24 cm from the centre of length.

The image formed is real, inverted and magnified. Real images can be taken on screens.