Question

(a) Explain the functions of the following parts of the eye
(i) cornea
(ii) iris
(iii) pupil
(iv) ciliary muscles
(v) eye-lens
(b) If you walk from a dark room into sunlight and back again into dark room, how would your pupils alter in size? What makes this happen?
(c) Explain why, we cannot see our seats first when we enter a darkened cinema hall from bright light but gradually they become visible.

Answer 1

Explanation:

a) i) cornea protect our eye

ii) iris gives color to our lense

iii) it is the padave through which light enters or retina

iv)the help in contacting and relaxing our lense

v) the converge light on retina

b) initially in dark room our lenses widen to percieve as much as light possible, however as we enter sunlight out lense contract to reduce the strong glare eventually on entering a dark room or lense widens again

c) when we are in sunlight our lense are contracted, as we enter a dark room reflection of light reduces therefore or lense have to widen to percieve maximum light that's why it takes time to locate our seat