Which of the following plays an important role in regulating the amount of light entering into the eye?

Correct option is C

The correct answer is (c) Iris

Explanation:

• The iris is the coloured part of the eye that controls the size of the pupil.

• By expanding or contracting, the iris regulates the amount of light entering the eye.

• In bright light, the iris constricts the pupil to reduce light entry.

• In dim light, the iris dilates the pupil to allow more light to enter.

• Thus, the iris plays the primary role in regulating light entering the eye.

Information Booster:

• The pupil is the opening through which light enters the eye.

• The colour of a person's eyes is determined by pigments present in the iris.

Additional Knowledge:

(a) Cornea (Option a)

• The cornea is the transparent outer covering of the eye.

• It helps in refraction of light.

• It does not regulate the amount of light entering the eye.

(b) Pupil (Option b)

• The pupil is an opening in the centre of the iris.

• Its size changes due to the action of the iris.

• It does not regulate itself independently.

(d) Retina (Option d)

• The retina is the light-sensitive layer at the back of the eye.

• It contains rod and cone cells.

• It receives images but does not control light entry.