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Colour. Humans have three types of cone cells, but some butterflies have at least four. Most mammals have no colour vision, for it is of no interest to their survival.

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What kind of wave is in the retina of the eye detect light and send signals to the brain?

rod and cone cells


Why you have trouble seeing bright colors at a candlelit dinner?

Because of the way your eyes work.Human eyes contain two types of cells that respond to light, named for their appearance: "rod cells" and "cone cells".Cone cells respond only to portions of the visible spectrum ... specifically, there are three kinds, each of which is most responsive to the band it's named after: "red", "green", and "blue". This is controlled by the specific pigment that's contained in the cell, which is very slightly different (and therefore a different color) in each.Rod cells respond to the entire visible spectrum. They may therefore seem kind of redundant ... the cone cells already cover the spectrum, so why bother keeping the rod cells around?It turns out the rod cells are a lot more sensitive to light. It takes a fair amount of light to trigger a cone cell (even if it's the right color of light to trigger that cone cell), but significantly less to trigger a rod cell.The rod cells are therefore important in low-light conditions. They give you at least minimal light-dark information, which is often enough to avoid hazards (that dark blob is probably a chair, while the lighter area surrounding it is the carpet). They don't provide any color information, though, since that comes from the cone cells.At a candlelit dinner (or any other low-light situation), the rod cells probably have enough light that you don't mistakenly stab your date's steak. However, the cone cells are only firing sporadically since they're working at the very bottom of their brightness range, so everything appears kind of grey and hopefully she won't notice the greenish tinge from the cheap meat you bought.


What kind of object can not allow light to pass?

an opaque one


Why cant you see the moon that well in the daytime?

Because of the way your eyes work.Human eyes contain two types of cells that respond to light, named for their appearance: "rod cells" and "cone cells".Cone cells respond only to portions of the visible spectrum ... specifically, there are three kinds, each of which is most responsive to the band it's named after: "red", "green", and "blue". This is controlled by the specific pigment that's contained in the cell, which is very slightly different (and therefore a different color) in each.Rod cells respond to the entire visible spectrum. They may therefore seem kind of redundant ... the cone cells already cover the spectrum, so why bother keeping the rod cells around?It turns out the rod cells are a lot more sensitive to light. It takes a fair amount of light to trigger a cone cell (even if it's the right color of light to trigger that cone cell), but significantly less to trigger a rod cell.The rod cells are therefore important in low-light conditions. They give you at least minimal light-dark information, which is often enough to avoid hazards (that dark blob is probably a chair, while the lighter area surrounding it is the carpet). They don't provide any color information, though, since that comes from the cone cells.At a candlelit dinner (or any other low-light situation), the rod cells probably have enough light that you don't mistakenly stab your date's steak. However, the cone cells are only firing sporadically since they're working at the very bottom of their brightness range, so everything appears kind of grey and hopefully she won't notice the greenish tinge from the cheap meat you bought.


Why is it necessary to have three kinds of cone cells operating in order to have full color vision?

because each of them processes a slightly different kind of pigment


What kind of rays do solar cells depend on for their effective function?

light rays


what kind of a shape is a funnel?

cone


What kind of shape is mount Kilauea?

it is a cone


When exposed to ultraviolet light skin cells produces that?

Skin cells do not produce a hat - no matter what kind of radiation falls on them.


What kind of a volcano is Paricutin?

cinder cone volcano


What kind o volcanoe is a relatively small cone of volcanic material formed from tephra?

it is a cc cinder cone


N function is produced when you slice a cone with a plane that is parallel to the base of the cone?

This kind of conic section is a circle