Understanding the Human Eye

What is the main function of the cornea in the human eye?

• To change images to electrical signals

• To protect the eye and help focus light

• To control the size of the pupil

• To carry signals to the brain

Which part of the eye is responsible for controlling the amount of light that enters?

• Retina

• Lens

• Pupil

• Optic nerve

What is the role of the iris in the eye?

• It changes images to electrical signals

• It controls the size of the pupil

• It carries signals to the brain

• It acts as a convex lens

Which part of the eye contains nerve cells called rods and cones?

• Cornea

• Lens

• Retina

• Iris

What is the function of rods in the retina?

• To sense colors

• To sense dim light

• To control the size of the pupil

• To focus images

How many types of cones are there in the retina, and what do they sense?

• Two types, sensing red and blue

• Three types, sensing red, green, and blue

• One type, sensing all colors

• Four types, sensing red, green, blue, and yellow

What is the main function of the optic nerve?

• To focus light on the retina

• To carry electrical signals to the brain

• To control the size of the pupil

• To protect the eye

What happens to the image formed on the retina?

• It is right-side up and enlarged

• It is upside-down and reduced in size

• It is right-side up and reduced in size

• It is upside-down and enlarged

How does the brain interpret the image received from the retina?

• As upside-down

• As right-side up

• As black and white

• As a mirror image

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What is the primary role of the lens in the eye?

• To protect the eye

• To fine-tune the focus of images

• To control the size of the pupil

• To change images to electrical signals