What is the function of iris?

It focuses light on retina.

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It controls the size of pupil.

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It controls ciliary muscles.

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It controls the size of cornea.

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Solution

The correct option is B
It controls the size of pupil.

Iris is the dark muscular diaphragm, which controls the size of the pupil. It is responsible for controlling the amount of light reaching the retina by regulating the size of pupil. The size of pupil can fluctuate as the iris has tiny muscles that can either widen or narrow, depending upon surrounding light. At night, the muscles will widen the pupil so there is sufficient light in the eye. When it is too bright outside, the pupil will contract to allow less light into the eyes and prevent damage of retina.

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Similar questions

Q. Match the following:

\begin{matrix} Part of eye & Function a) Iris & p) Converts the light into neural signals, and sends these signals to the brain for visual recognition . b) Lens & q) It bends the light onto the lens. c) Retina & r) Controls size of pupil and amount of light reaching the retina. d) Cornea & s) Focuses light onto the retina and helps the eye to focus objects at different distances. \end{matrix}

Q. Match the following:

\begin{matrix} Part of eye & Function a) Iris & p) Converts the light into neural signals, and sends these signals to the brain for visual recognition . b) Lens & q) It bends the light onto the lens. c) Retina & r) Controls size of pupil and amount of light reaching the retina. d) Cornea & s) Focuses light onto the retina and helps the eye to focus objects at different distances. \end{matrix}

Q. Fill in the following blanks with suitable words:
(a) Most of the refraction of light rays entering the eye occurs at the outer surface of the.............
(b) The part of eye sensitive to light is...................
(c) The part of eye which alters the size of the pupil is............
(d) When light is dim, the pupil becomes................
(e) The iris controls the amount of................entering the eye.
(f) The ciliary muscles control the shape of the ...............
(g) To bring light from a distant object to a focus on the retina of the eye, the convex eye-lens needs to be made..........
(h) To bring light from a near object to a focus on the retina of the eye, the convex eye-lens need to be made.......

Match the following in most appropriate way:
$\begin{matrix} Part of eye & Function a) Iris & p) Converts the light into neural signals, and send these signals on to the brain for visual recognition. b) Pupil & q) Primarily focuses and controls the entrance of light into the eye. c) Convex lens & r) Regulates the amount of light reaching the retina. d) Retina & s) Controls size of pupil and amount of light reaching the retina. e) Cornea & t) Focuses light onto the retina and help the eye to focus on objects at different distances. \end{matrix}$

Q. is the dark muscular diaphragm that controls the size of the pupil.

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