(a) State one important function of the following parts of the human eye : (i) Retina (ii) Pupil (b) State…
(a) State one important function of the following parts of the human eye :
(i) Retina
(ii) Pupil
(b) State the role of ciliary muscles in focussing objects at varying distances from the eye.
Solution
(a) (i) Retina behaves like a light sensitive screen on which image of an object is formed.
(ii) Pupil : regulates and controls the amount of light entering the eye.
(b) When ciliary muscles relax or contract they change the curvature of eye lens and hence the focal length to focus objects at varying distances from the eye.
[Alternate answer of (b): It regulates the focal length or thickness of the lens.]