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The diagram below shows how the iris and pupil of a human eye appear under different conditions.

      

The diagram below shows how the iris and pupil of a human eye appear under different conditions.
physics52420171044.jpg
(a) Name the structures labeled X and Y.
(b) (i) State the condition that leads to the change in appearance shown in the diagram labeled B.
(ii) Describe the changes that leads to the appearance of the iris and pupil as shown in the diagram labeled B.
(iii) What is the s

  

Answers


John
(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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