Physics, 07.03.2020 04:19, griffislandon74
The eyes of amphibians such as frogs have a much flatter cornea but a more strongly curved (almost spherical) lens than do the eyes of air-dwelling mammals. In mammalian eyes, the shape (and therefore the focal length) of the lens changes to enable the eye to focus at different distances. In amphibian eyes, the shape of the lens doesn't change. Amphibians focus on objects at different distances by using specialized muscles to move the lens closer to or farther from the retina, like the focusing mechanism of a camera. In air, most frogs are nearsighted; correcting the distance vision of a typical frog in air would require contact lenses with a power of about −6.0D .
A frog can see an insect clearly at a distance of 10cm . At that point the effective distance from the lens to the retina is 8mm .
If the insect moves 5cm farther from the frog, by how much and in which direction does the lens of the frog's eye have to move to keep the insect in focus?
a. 0.02cm, toward the retina.
b. 0.02cm, away from the retina.
c. 0.06cm, toward the retina.
d. 0.06cm, away from the retina.
Answers: 3
Physics, 22.06.2019 02:50, adrian08022
Ammonia enters the expansion valve of a refrigeration system at a pressure of 10 bar and a temperature of 18oc and exits at 6.0 bar. the refrigerant undergoes a throttling process. determine the temperature, in oc, and the quality of the refrigerant at the exit of the expansion valve.
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Physics, 22.06.2019 12:00, Emieloy2959
Ihave a density of 1.61g/cm^3 and a mass of 28g. find the missing value
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The eyes of amphibians such as frogs have a much flatter cornea but a more strongly curved (almost s...
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