Question

where should an object be placed in front of convex lens to get magnification of is negative 1​

Answer 1

Explanation:

object is place at 2F ,

I hope it helps you,

Answer 2

Explanation:

If the magnification is −1, then,

v/u=−1

⇒v=−u.

Then,

=>1/v−1/u=1/f

⇒−1/u−1/u=1/f.

⇒−2/u=1/f

⇒u=−2f.

The distance of the object from the mirror is twice the focal length