18 questions in Phys Light and color

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QUESTION 1 1. Some of the ink from a printer has the following reflection curve. What color do we see when we look at the ink? A. Magenta B. Yellow C. Cyan D. Red 5 points QUESTION 2 1. What color does a dichroic red filter reflect? A. Red B. Blue C. Green D. More than one of these 5 points QUESTION 3 1. A filter serves the function of A. Transmitting color(s) B. Adding color(s) from the light which is incident upon it to the light which is incident upon it C. Reflecting color(s) of light which is incident upon it D. Polarizing the light which is incident upon it 5 points QUESTION 4 1. A surface is illuminated with Magenta-colored light. The surface absorbs blue light. What will be the color of the reflected light? A. Red B. Blue C. Cyan D. Black 5 points QUESTION 5 1. A blue object will appear black when illuminated with A. Blue light B. Cyan light C. Yellow light D. Magenta light 5 points QUESTION 6 1. I would like to create 545 nm green using the colors in the chromaticity diagram below. What are the relative fractions of red (X), green (Y) and blue (Z) that will give me that color? A. 67% red, B. 0% red, 23% green and 10% blue 100% green, and 0% blue C. 15% red, 52% green and 33% blue D. 27% red, 72% green and 1% blue 10 points QUESTION 7 1. Referring to the chromaticity diagram in Question 6, where are the saturated colors in that diagram located? A. In the center of the horseshoe B. Along the borders of the horseshoe C. All along the bottom of the horseshoe D. Nowhere - all of the colors of the horseshoe are unsaturated 5 points QUESTION 8 1. Referring to the chromaticity diagram in Question 6 again, what is the approximate complimentary color to 770 nm red? A. 492 nm bluish cyan B. 380 nm violet C. 520 nm green D. 500 nm blue 5 points QUESTION 9 1. Referring to the chromaticity diagram in Question 6, suppose we want to design a computer monitor and define the range of colors it can display by using a color triangle composed of 580 nm yellow, 490 nm bluish/cyan and 600 nm orange. Suppose we now want to watch a football game between two sports teams, one which has red jerseys (say the San Francisco 49ers) and one which has cyan jerseys (say the Jacksonville Jaguars). How will the two teams' jerseys look on the monitor, respectively? A. Cyan and blue B. White and magenta C. Orangish-yellow and cyan D. White and cyan 10 points QUESTION 10 1. White is an equal mixture of red, green and blue. What is another metamer for white light? A. Red and Cyan B. Cyan, C. Blue D. All Magenta and Yellow and Yellow of the above: red + cyan, cyan+magenta+yellow, blue+yellow 5 points QUESTION 11 1. Television screens combine colors using A. Partitive mixing B. Subtractive mixing C. Lightness mixing D. Additive mixing 5 points QUESTION 12 1. In order to describe colors, the brain uses the psychological primary colors, which are A. Red, blue and green B. Red, blue, green and white C. Red, blue, green and yellow D. Red, yellow and blue 5 points QUESTION 13 1. White light illuminates a surface, which absorbs nearly all of the blue light and about half of the green light. What color will the reflected light look like to us? A. Brown B. Yellow C. Red D. Orange 5 points QUESTION 14 1. The difference between a spectral color and a non-spectral color is that A. A spectral color is produced by a gas, while a non-spectral color comes from a blackbody B. Spectral color is limited to wavelengths short of red C. A spectral color comes from light at a specific wavelength, while non-spectral color can come from a combination of light at a bunch of different wavelengths D. Spectral color can only be produced directly by emitting sources, while non-spectral color can only be produced by reflecting white light off surfaces 5 points QUESTION 15 1. A filter that passes only monochromatic red light at 650 nm is placed on top of a filter that passes only monochromatic green light at 530 nm. When 460 nm blue light strikes one side of the pair of filters, the light that comes out of the other side (after passing through both filters) is A. Red B. Green C. Blue D. Black: no light comes out the other side 5 points QUESTION 16 1. Suppose I stare at a yellow screen with green writing on it for a very long time. I then look away, toward a white, featureless wall. What will I likely see? A. A black afterimage of the writing on the screen, and nothing else B. A blue afterimage of the screen, and an afterimage of the writing that looks magenta C. A magenta afterimage of the screen, and an afterimage of the writing that looks blue D. Nothing at all 5 points QUESTION 17 1. A monochromatic white beam A. is very bright B. is completely saturated C. is completely unsaturated D. is very dim 5 points QUESTION 18 1. Just before the Battle of Midway in World War II, the U.S. submarine Trigger ran aground on a reef. The officers were wearing red goggles, so the bright lights inside the submarine wouldn't interfere with their ability to see in the dark ocean. On their maps, the reefs were marked in red. Why did they run aground? A. Because the whole map would have looked dark B. Because with the red filters on their goggles, the reefs would have looked the same color as the rest of the map, making it hard to identify them C. Because with the red filters on their goggles, the afterimages of the reefs on the maps would have interfered with their view of the ocean floor D. Because the goggles would have blocked their peripheral vision 5 points
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