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

Power of a lens of focal length 25 cm is

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

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

A lens has a power of +2.0 Dioptre. Which one of the following statements about the lens is true ?

The focal length of normal eye lens is about