Tag: human eye and its working

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Multiple choice physics the human eye and the colourful world human eye and its working what is inside our eyes? human eye and defects of vision

State whether true or false :

Pupil controls the amount of light entering an eye.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

True

The iris is the ring of pigmented tissue surrounding the pupil that varies in color. The iris opens and closes to control the amount of light entering the eye through the pupil. The pupil is the opening in the center of the iris where light enters the eye.

Multiple choice physics the human eye and the colourful world human eye and its working what is inside our eyes? human eye and defects of vision

The dark muscular diaphragm in the human eye that controls the pupil is:

  1. Iris

  2. Retina

  3. Cornea

  4. Sclera
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A. Iris is the muscular diaphragm in the human eye that controls the pupil.

B. Retina is a layer at the back of the eyeball that contains cells sensitive to light, which trigger nerve impulses that pass via the optic nerve to the brain, where a visual image is formed.
C. Cornea is the transparent layer forming the front of the eye.
D. Sclera is the white outer layer of the eyeball. At the front of the eye it is continuous with the cornea.

Multiple choice physics the human eye and the colourful world human eye and its working what is inside our eyes? human eye and defects of vision

Our eye lens is held in position by :

  1. Rods and cones

  2. Iris and pupil

  3. Ciliary muscles

  4. None of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The ciliary muscle is found in the middle layer of eye.  It is responsible for viewing objects at various distances. It helps to change the shape of the lens within the eye and holds it in position.