How are you able to make man see yellow using this simulation? Explain why we ca

Question

How are you able to make man see yellow using this simulation? Explain why we can see this as yellow even though we are only using red, green, and blue lights. What changes do you see in the simulation when you adjust the brightness of the red light? How do these changes affect the stimulation of the three cones within the man's eye? Does it affect what color his brain says he is seeing? Why or why not? Does it affect the wavelength of the light hitting his eye? Why or why not? In this context, explain how we can see something on the color TV as the color white or as the color grey? In the back of your favorite comic book is an ad for a giant magnifying glass that attaches on the front of your TV screen. It claims that this will allow you to see far better detailed images of your favorite TV actors. What is the problem with this claim?

Explanation / Answer

i) We can make the man see yellow by using red and green lights on full brightness. However keeping red and gree at maximum brightness and blue at moderate brightnes also makes the man see yellow but of different shades at different brightness of blue light.

Red, green and blue are known as the primary colors and any color visible to human eye can be made using various combinations of these three primary colors.

ii) On decreasing the brightness of the red color, the yellow color gradually is converted to green; that is the man starts obseving green color.

iii) A human eye has three different types of cones viz blue(short-wavelength sensitive cones or S-cone), green(middle-wavelength sensitive cones or M-cones) and red(long-wavelength sensitive cones or L-cones) cones; which are sensitive to the light of respective color. If more brightness of red light is incident in man's eye, his red cones will become more active and o on. This affects the color the brain interprets because the brain senses the color throught the cone of the eye only.

Also by making the changes in the simulation we are varrying the wavelength of the light incident in the man's eye. Actually wavelength is a measure of color this means different colors sensed by our eye corresponds to the different wavelength of light.

iv) Something can be seen white or grey when red, green and blue light of almost equal brightness is coming out of the TV Screen. The more the brightness of these lights the more whiter is the colour, the less the brightness the less whiter is the color that we see. That is if red, green and blue lights of equal brightness are taken together then, as we keep on in creasing the brightness equally(from dark), the color we see gradually moves from blacj to grey to white.

v) The problem with the claim is that it will make the image appear better, however the lens cannot increase the brightness of the image(infact it will reduce the brightness due to absorption) as in order to increase the brightness of the image we need more light which the magnifying lens cannot provide.

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