Unit+4+Color

Unit 4: Color

Why does an apple appear red to the human eye?

Us humans have special "cones" in our eyes that enable us to see color. Therefore, the sun produces colors (visible light) ehich we can see. Most opaque objects (objects that we cannot see through) reflect certain colors and absorb others. An apple absorbs orange, yellow, green, blue, indigo, and violet. It reflects the visible light called red. That red light that is reflected then reflects into our eyes, and we see the apple as red.

How does color filter interact with light?

Red filter only allows red light to pass through and absorbs all the other colors. Blue filter only allows blue light to pass through and absorbs all the other colors. Color filters will only allow a specific color of light to pass through and will absorb all the other colors.

Explain how a r a i n b o w is produced.

In the making of a rainbow, the raindrops act as prisms, and the sun is the source of light. Light from the sun __refracts__ off the side of a raindrop and exits. In the process, the white light is broked into a spectrum of colors called visible light. The angle between the ray of light coming in and the ray of light coming out of the raindrop is 42 degrees for red light and 40 degrees for violet. Those colors reach out eyes and poof! we see a rainbow in the sky!

Unit 4: Color B Layer Activity - COLORBLINDNESS

Some types of colourblindness: - Red-green hereditary (genetic) photoreceptor disorders - Dichromacy - one cone system is compromised - Monochromacy - black & white vision only.
 * Colour blindness is the inability to sense the difference between some colours that other people with regular eyesight can distinguish. The normal human retina contains two kinds of light sensor cells: the rod cells, and the cone cells. The cones are activated when the pigments absorb light.

If one parent has colour-blindness, their children may also suffer from colourblindness because the condition is most commonly passed on genetically. Males are most likely to inherit colourblindness genetically because it is carried via the X chromosome. Since males only have one X chromosome, there is no X chromosome to cancel out the dominant gene. Colourblindness can also be acquired, like the effect of trauma to the eye or brain. **

==<span style="COLOR: rgb(131,13,171)"><span style="COLOR: rgb(185,4,82)"><span style="COLOR: rgb(9,11,10)">[|Discover Magazine Article on Colorblindness]      == ==<span style="COLOR: rgb(228,73,7)"><span style="COLOR: rgb(246,244,14)"><span style="COLOR: rgb(32,246,30)"><span style="COLOR: rgb(5,5,209)"><span style="COLOR: rgb(131,13,171)"><span style="COLOR: rgb(185,4,82)"><span style="COLOR: rgb(9,11,10)">      == <span style="COLOR: rgb(228,73,7)"><span style="COLOR: rgb(246,244,14)"><span style="COLOR: rgb(32,246,30)"><span style="COLOR: rgb(5,5,209)"><span style="COLOR: rgb(131,13,171)"><span style="COLOR: rgb(185,4,82)"><span style="COLOR: rgb(9,11,10)"> This article talks about how it has been discovered that colourblindness can in fact benefit some animals. Researchers observed several capuchins, some who were colorblind, and some who had completely normal vision. They learnt that the colorblind capuchins made approximaetly 20 insect-captures per hour, while those with normal vision only made 16 captures. An explanation for this is thought to be because for an animal or human suffering from colorblindness, the reduction in color signals makes it much easier for the eye to sense differences in brightness and texture in our surroundings. This means that insects and other animals that might use color-camouflage to hide from predators can be sensed much easier by an animal with colorblindness because of a heightened sense for texture and brightness, rather than color. This could also have been an advantage for early human beings who suffered from colorblindness. But with the lessening need for humans to hunt and capture their own prey, colorblindness may have not arisen and persisted so commonly among humans as time wore on.



C Layer 1. Using diagrams explain the dispersion of light.**

Dispersion is the optical phenomena where white light is broken into rays of different wavelengths, or colours. This happens when white light is refracted through a prism. The white light is broken spatially into red, orange, yellow, green, blue, indigo, and violet-- otherwise known as the colours of the spectrum.



How white light is produced?

There are three primary colors of light: Red, Green, and Blue

Red and Green overlap will form yellow Red and Blue overlap will form magenta Green and Blue overlap will form cyan



When the three primary colors overlap eachother, WHITE LIGHT is produced!