Tag: the human eye and the colourful world

Most of the refraction for the light rays entering the eye occurs at the outer surface of the cornea.

True

A. Iris is the muscular diaphragm in the human eye that controls the pupil.

In long sightedness eyes ball's size decrease or focal length of the lens increase due to which image will form behind in the retina.

The iris is the area of the eye that contains the pigment which gives the eye its colour.

In eye light passes through the eye's lens and falls on the retina. The mechanism is same as a convex lens converges parallel beams of light in its focus.

When the light is very bright, then iris makes the pupil contract so that less amount of light enters into the eye.

The ciliary muscle is found in the middle layer of eye.  It is responsible for viewing objects at various distances. It helps to change the shape of the lens within the eye and holds it in position.

Image on the retina remains for 1/20 sec.