SELECT * FROM question_mgmt as q WHERE id=3777 AND status=1 SELECT id,question_no,question,chapter FROM question_mgmt as q WHERE courseId=9 AND subId=16 AND chapterId=262 and ex_no='2' AND status=1 ORDER BY CAST(question_no AS UNSIGNED) CBSE Free NCERT Solution of 10th science The Human Eye and the Colourful World the change in focal length of an eye lens is cause

Question:

The change in focal length of an eye lens is caused by the action of the

         (a) pupil.                        (b) retina.
         (c) ciliary muscles.        (d) iris.

Answer:

(c) Ciliary muscles

The change in the focal length of an eye lens is caused by the action of ciliary muscles. The degree of refraction is changed by the changing of the convexity of the lens and this is done by the ciliary muscles.

 


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