INSIGHT UPSC QUIZ

Science & Technology General Science
Q.

Consider the following statements: 

1. The aperture of the pupil of a human eye can be changed with the help of the ciliary muscles. 

2. The curvature of human eye cannot be changed, because the lens of a human eye is fixed. 

Which of the statements given above is/are correct?

Explanation:

ANSWER: (D) 

The Pupil

  • The pupil of an eye acts like a variable aperture whose size can be varied with the help of the iris. (Thus, Statement 1 is not correct)
  • When the light is very bright, the iris contracts the pupil to allow less light to enter the eye. However, in dim light the iris expands the pupil to allow more light to enter the eye. Thus, the pupil opens completely through the relaxation of the iris.

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