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

The focal length of normal eye lens is about

Power of a lens of focal length 25 cm is

Which type of image of an object is formed by eye lens of the retina?

What is the magnification produced by a concave lens of focal length 10 cm, when an image is formed at a distance of 5 cm from the lens?

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