The size of the pupil is controlled by the

Identify the part of the eye concerned with the following two sentences in the given figure. Which alphabet is used to indicate this part?
$1$. It is the coloured visible part of the eye.
$2$. It is a pigmented and opaque structure.

Suppose a person wears convex glasses for proper vision. Where do you think the image of the object is formed in his eyes when he is not using the glasses?

Corneal grafting is especially successful because:

The area of the retina where the image is formed most clearly is called the.........

The pupil is a part of the ........