If the focal length of a magnifying glass is 2.5 cm, it can magnify an object :

If the lens power of glass is +2 dioptre, its focal length will be-

In a convex lens, if the object is placed at 2F (twice of the focal length), the image formed will be -

Power of a lens of focal length 25 cm is

What type of lens is used in magnifying glass?

The change of focal length of an eye lens is caused by action of the