A normal eye has retina 2 cm behind the eye-lens. What is the power of the eye-lens when the eye is (a) fully relaxed, (b) most strained?

What is the nature of the eye lens and what does the eye lens do ?

The screen behind the eye lens is called the

Find the power of the eye lens of the normal eye when it is focussed at its far point.

What is the focal length of the eye lens of a normal eye in relaxed position of eye muscles ?

What is the power of the lens, if the far point of a short- sighted eye is 200 cm?

The near point and the far point of a child are at 10 cm and 100 cm. If the retina is 2.0 cm behind the eye-lens, what is the range of the power of the eye-lens?