To bring light from a distant object to a focus on the retina of the eye, the convex eye-lens needs to be made .
(Choose from: thicker / thinner.)

Why is a normal eye not able to see clearly the objects placed closer than $25 \mathrm{cm}$?

What changes take place in the shape of eye-lens when the eye is focused on a near objects?

What changes take place in the shape of eye-lens when the eye is focused on a distant objects?

The eyes of a person are focused (i) on a nearby object and (ii) on a distant object, turn by turn. In which case the focal length of eye-lens will be the maximum?

The eyes of a person are focused (i) on a nearby object, and (ii) on a distant object, turn by turn. In which case the converging power of eye-lens will be the maximum?