How the Eye Works

Question 1

Lily moves from a brightly lit kitchen into a dark hallway. Which statement best explains how Lily’s pupil changes and why this helps her see the hallway?

Accepted Answer

Lily’s pupil expands so more light can enter the eye, allowing the retina to receive enough light in the dark hallway.

Answer

Lily’s pupil shrinks so less light enters, protecting the eye from too much darkness.

Answer

Lily’s pupil stays the same size, but the lens becomes clearer to let in extra light.

Answer

Lily’s pupil expands, which makes the image on the retina larger, so she can see details better.

Question 2

While watching a firefly glow at night, the light travels through several parts of your eye before your brain understands the picture. Which choice correctly lists the four parts in the order the light passes through them and tells what each part does?

Accepted Answer

Pupil – lets light in; Lens – focuses light; Retina – detects light; Optic nerve – sends signals to the brain.

Answer

Lens – lets light in; Pupil – focuses light; Retina – sends signals to the brain; Optic nerve – detects light.

Answer

Pupil – focuses light; Lens – detects light; Optic nerve – sends signals to the brain; Retina – lets light in.

Answer

Retina – lets light in; Pupil – detects light; Lens – sends signals to the brain; Optic nerve – focuses light.

Question 3

Which of the following shows the correct order of what happens inside your eye when you look at something?

Accepted Answer

Light enters the pupil → lens focuses the light → retina detects the light → optic nerve sends signals to the brain → brain interprets the image.

Answer

Light enters the pupil → retina detects the light → lens focuses the light → optic nerve sends signals to the brain → brain interprets the image.

Answer

Light enters the pupil → lens focuses the light → optic nerve sends signals to the brain → retina detects the light → brain interprets the image.

Answer

Light enters the pupil → lens focuses the light → retina detects the light → brain interprets the image → optic nerve sends signals to the brain.

Try three questions

Lily moves from a brightly lit kitchen into a dark hallway. Which statement best explains how Lily’s pupil changes and why this helps her see the hallway?

While watching a firefly glow at night, the light travels through several parts of your eye before your brain understands the picture. Which choice correctly lists the four parts in the order the light passes through them and tells what each part does?

Which of the following shows the correct order of what happens inside your eye when you look at something?

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