Yellow Shirt in Blue Light

The Venn diagram shows what mixing various lights (as opposed to paints) looks like. For example, yellow light is simply a mixture of red and green color light wavelengths. If a shirt is yellow, this means that it reflects yellow light, which by extension means that it will reflect red and green light. However, yellow light is not made up of any blue light, which means the shirt absorbs blue light.

If all the light shining on the shirt is blue, all light will be absorbed. Therefore, the shirt would appear black.

Yellow objects only reflect red and green light. Blue light is not reflected so no light is reflected by the shirt making it look black.

In the real world, using various 'blue' lights and various 'yellow' materials, then 'black' will happen more often than pure yellow, green or blue. However the most common result would likely be a very dark blue or green.

The 'logic' of the question is workable, but only if you correctly anticipate the assumptions the questioner has made - which are not the only viable assumptions that result in one of the allowed answers.

Alternate correct assumptions and answers are:

1) Blue - Assume the light source is a mix of "blue" wavelengths. Assume the shirt is yellow because it includes reflected green and red threads. Assume the wavelengths of the green threads overlap with the blue cones of the human eye. The result will be that the shirt will reflect some of the blue wavelengths, resulting in a blue shirt.

2) Green - Basically the same scenario as above, except the reflected wavelengths predominantly are in the green cone spectrum.

3) Yellow - Assume the shirt absorbs blue light and emits yellow light.

4) Green, Yellow, or Blue - Assume the shirt's color includes thin film interference. The result (depending on exactly what wavelengths are in the 'blue' light and exactly what TFI is happening), could be green or yellow or blue.

Yellow objects reflect yellow light (which is a mixture of red and green light) but don’t reflect any other color (like blue light). Since it doesn’t reflect blue light, and blue light is the only light in the room... there wouldn’t be any light reflected to our eyes! And since a lack of light is represented by our eyes as black, the shirt would appear black.

On a side note, most of are taught misinformation in art class. We are taught that the 3 primary pigments are red, yellow, and blue. Technically the 3 primary subtractive colors (i.e. pigments) are magenta, yellow, and cyan (teal in this case). The primary subtractive colors are also the secondary additive colors. The primary additive colors (i.e. light) are red, green, and blue. It is conventional to assume additive unless otherwise specified. Therefore the primary colors are technically red, green, and blue.

Under colored most of objects appear to be of the same color as that of the object or may appears Black .So a yellow object under white light will absorb most of the colours of light, and reflect back the yellow light, so we can see yellow.

As yellow light is a mixture of red and green light, yellow will also reflect red and green light. This means that a yellow object will appear red under red light, and green under green light. .Since it is not a mixture of Blue light it wont appear Blue , Rather it will appear black.

just because the room is dark , it reflect no color to our eyes so it's turn to black

yellow colour of the shirt! THIS MEANS THAT shirt absorbs all the colours except yellow(it reflects it). so,blue is absorbed by the shirt when it is shined on it, and reflected is NOTHING(or BLACK).

When an object appears to be a certain color, it is absorbing every color BUT the color it appears.

In this case, when we shine a blue light, on an object that only reflects yellow light, all of the blue light will be absorbed and none of it will be reflected. When no light is reflected, it appears to our eyes to be black.

From the knowledge of basic colours we know that....yellow +blue =green..again green +green =green...and red +green =is perhaps black