Question

PLS HELP!!

What is the function of the iris?

A. It converts light into electric signals that are sent to the brain through the optic nerve

B. It focuses the light onto the light-sensor cells at the back of the eye

C. Its curved surface helps to focus light entering the eye

D. It contracts and expands to control the amount of light that enters the eye

Answer 1

D.

Step-by-step explanation:

The iris has special muscles that are constantly contracting and expanding to adapt to the amount of light entering your eyes. That's why your iris dialates when you're in the dark, its becomes larger to adapt to the low lighting so you are able to see better

Answer 2

B

Step-by-step explanation:

The iris controls the amount of light that enters the eye by opening and closing the pupil. The iris uses muscles to change the size of the pupil. These muscles can control the amount of light entering the eye by making the pupil larger (dilated) or smaller (constricted).