Question

Light ray entering the eye is controlled by
A. Pupil
B. Iris
C. Cornea
D. Enzymes

Answer 1

Hint:- Light entering into our after being reflected by the object strikes our retina and due to this we are able to see that object. The amount of light varies throughout the day and the eyes muscles are involved in controlling the amount of light entering by increasing or decreasing the aperture of the eye lens.

Complete step-by-step solution:-Eye is one of the sense organs of our body, presented on the head region in the eye sockets and is prevented from any damage by eyelids and lashes present.
We know the structure of eye consist of:
Iris: It is the outermost part of the eye, which is attached to muscles known as iris muscles. Its function is to constrict the pupil of the eye to control the amount of light entering the eye.
Pupil: It is the part of iris from where the light enters the eye. The pupils are controlled by muscles of eyes.
Cornea: It is the transparent part of the eye covering iris and the only part of our body without blood vessels. Its function is to focus the light entering eye onto the retina
Lens: It is the transparent part of the eye lacking the ability to repair if damaged. It changes its aperture to focus the near or distant objects. The controlling of the lens is done by the ciliary muscles.
Retina: It is part of the eye where the image formation occurs.
Chambers of eye: The eye part is divided into two chambers, anterior- aqueous chamber and posterior- vitreous chamber. Their function is to provide nourishment and maintenance to their respective parts.
Aqueous chamber: nourishes cornea and iris.
Vitreous chamber: maintains the shape of the eyeball.
Thus the correct option is B, since the amount of light entering the eye is controlled by Iris through the Iris muscles present in the eye.

Note:- : when we enter a dark room from the bright light, we are not able to see something for a few seconds this is because of the expanding pupil in dark light so that enough light enters our eye and we are able to see in a dark room.