The eye and camera

What happens when you start to see colors in the rings of the disk?

• Your eyes are playing tricks on you.

• The disk changes color.

• You are being hypnotized.

• The disk is spinning.

How does the lens in your eye focus on objects?

• By moving back and forth.

• By changing shape.

• By zooming in and out.

• By rotating.

Why don't things look partially out of focus all the time?

• Because the lens in your eye is achromatic.

• Because your brain fills in the gaps.

• Because your eyes have a built-in filter.

• Because your eyes adjust the light intensity.

What causes us to be color blind in the dark?

• The presence of only one type of photoreceptor.

• The absence of light.

• The uneven distribution of photoreceptors.

• The brain's inability to process colors.

Why do faint stars seem to disappear when you look directly at them?

• Because of the uneven distribution of photoreceptors.

• Because of the brain filling in the gaps.

• Because of the blind spot in the eye.

• Because of the lack of blue light receptors in the center of the retina.

What is the blind spot in our eyes?

• An area with unevenly distributed photoreceptors.

• An area with only red light receptors.

• An area with only blue light receptors.

• An area with no photoreceptors.

Why does the center of an image look like it's jittering around?

• Because the image is moving.

• Because the brain is filling in the gaps.

• Because of the uneven distribution of photoreceptors.

• Because your eye actually jiggles most of the time.

Why can't you see your own eyes shift as you look from one to the other in a mirror?

• Because of the blind spot in your eyes.

• Because the mirror distorts the image.

• Because your brain fills in the gaps.

• Because your vision shuts down during larger eye movements.

What is one advantage of video cameras over human eyes?

• They can process visual illusions.

• They can see in the dark.

• They can fill in the gaps in vision.

• They can capture details our eyes miss.

What is a key difference between the photoreceptors in a camera and those in the human eye?

• Camera photoreceptors are unevenly distributed.

• Human eye photoreceptors respond selectively to different wavelengths of light.

• Camera photoreceptors are more sensitive to dim light.

• Human eye photoreceptors require a color filter.