Q. Which of the following is/are correctly matched?

1. Cornea - transparent bulge on the front part.
2. Pupil - present behind cornea.
3. Iris- controls the size of the pupil

Select the correct answer from the codes given below:
Answer: Only 1 and 3
Notes: The human eye is like a camera. Its lens system forms an image on a light-sensitive screen called the retina. Light enters the eye through a thin membrane called the cornea. It forms the transparent bulge on the front surface of the eyeball. The eyeball is approximately spherical in shape with a diameter of about 2.3 cm. Most of the refraction for the light rays entering the eye occurs at the outer surface of the cornea. The crystalline lens merely provides the finer adjustment of focal length required to focus objects at different distances on the retina. There is a structure called iris behind the cornea. Iris is a dark muscular diaphragm that controls the size of the pupil. The pupil regulates and controls the amount of light entering the eye.

This question is part of UPSC Daily 20 MCQ Series Course on GKToday Android app.