During accommodation, the eye lens A. becomes more flexible B. changes its focal

Question

During accommodation, the eye lens A. becomes more flexible B. changes its focal length C. becomes stiffer D. moves forward or backward within the eyeball

An animal living in water (say, a fish)

Cannot use its cornea to refract light into a sharp image

Needs a higher power lens than a land-dwelling animal

Needs a lower power lens than a land-dwelling animal

Can use a lens withe the same power as a land-dwelling animal

When you're reading a textbook at low light levels, the text looks less sharp than when you read at high light levels. Why?

At low light levels, there aren't enough rays entering the eye to see something as sharp

At low light levels, your pupils are dilated to let in more light, which makes your depth of field smaller, thus making it easier for things to be out of focus

At high light levels, your pupils contract to let in less light, which makes your depth of field larger, making it easier for things to be in focus

B and C: At low light levels, your pupils are dilated to let in more light, which makes your depth of field smaller, thus making it easier for things to be out of focus, while at high light levels, your pupils contract to let in less light, making your depth of field larger, bringing more things into focus.

Cannot use its cornea to refract light into a sharp image

Needs a higher power lens than a land-dwelling animal

Needs a lower power lens than a land-dwelling animal

Can use a lens withe the same power as a land-dwelling animal

Explanation / Answer

1. D

2. A. Cannot use its cornea to refract light into a sharp image

3. B and C: At low light levels, your pupils are dilated to let in more light, which makes your depth of field smaller, thus making it easier for things to be out of focus, while at high light levels, your pupils contract to let in less light, making your depth of field larger, bringing more things into focus.

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