(a) X -Pupil,
Y - Circular muscles
(b) (i) Dum light/ low light intensity/ darkness/ dull light
(ii) Circular muscles in iris relax, while radial muscle contract. The pupil becomes bigger allowing more light to enter the eye.
(iii) Allows one to visualize or see objects under dim light
johnmulu answered the question on May 24, 2017 at 07:58
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