Through which aperture light enters the eye ?

Look at the figure and answer the following questions: What is the name of the circular aperture through which light enters the eye?

Which of the following controls the amount of light entering the eye ?

A person walking in a dark corridor enters into a brightly lit room : (a) State the effect on the pupil of the eye. (b) How does this affect the amount of the light entering the eye ?

Through which aperture ,brain is continuous with spinal cord?

Through which aperture, brain is continuous with spinal cord?

The aperture controlling the amount of light entering the eye is called