Cones are cells present in the retina of the eye which is sensitive to bright light and which is shaped like a cone. These cells are responsible for colour vision.

The transparent front part of an eye is called the cornea. It controls the light entering the eyes. It can even refract or bend the light reaching the lens. Note: It is the outermost layer which protects eyes with eyelids.

The phenomenon of splitting of white light into seven colours is called dispersion of light. It occurs due to the different degrees of refraction of each colour. Note: When a beam of sunlight is passed through a glass prism, it splits up into seven colours.

The ray of light which falls on the mirror or a reflecting surface is called the incident ray. Note: The angle between incident ray and the normal is incident angle.

Label the different parts of the human eye and answer the question that follow. Which part of the eye gives it its distinct colour?

Iris gives a distinct colour to eye. When there is bright light, the iris closes the pupil to let in less light and when there is low light, the iris opens up the pupil to let in more light. Cornea is the transparent front part of the eye which protects and covers the eye.