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The muscles of the iris control the
  • a)
    Optic nerve
  • b)
    Opening of the pupil
  • c)
    Focal length of the eye-lens
  • d)
    Shape of the crystalline lens
Correct answer is option 'B'. Can you explain this answer?
Verified Answer
The muscles of the iris control thea)Optic nerveb)Opening of the pupil...
The pupil of an eye provide a variable aperture, whose  size  is controlled by iris
a) When the light is bright: Iris contracts the pupil, so that less light enters the eye.
b) When  the  light  is dim:  Iris expand  the pupil,  so  that more  light enters  the eye. Pupil open completely, when  iris  is  relaxed.
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The muscles of the iris control thea)Optic nerveb)Opening of the pupilc)Focal length of the eye-lensd)Shape of the crystalline lensCorrect answer is option 'B'. Can you explain this answer?
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