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Nothing comes through. A red light emits no blue light, and a blue filter allows

only blue light to pass ... that's why when you look at it, you say to yourself

"Hey! That filter looks blue. I'll call it a 'blue filter'."

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Q: What colour comes through when a red light passes through a blue filter?
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Related questions

What colour comes through when white light goes through a red filter?

red because red through red makes red! ;)


What color of light is produced when red light is added to green light?

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The first load of water that passes through an activated carbon filter may contain some carbon dust (which will give it a tint of black). You are normally advised to flush the filter through once or twice and discard these first flushings. You will find that after this the water comes through clear. I am sure the carbon will not harm you but just to be safe discard the tinted water.


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Why colour of light become red when it passes through red colour?

White light contains all colors. When white light passes through red glass, for example (or any red thing that passes light through it), all of the colors except red are removed (filtered out) so the resulting light only contains the color red. This is a big part of the reason why that piece of glass comes to be called "red" glass.


What happens to food as it passes through the digestive system?

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After pure, white light passes through a red filter, all the other colors in the spectrum will flow out of the other side. My mistake, I had a faulty source. A red light filter will cause the image to appear as different shades of red. Since it is a red filter only red light can pass through. So you finish up with red light. Whether it is focussed to an image or not is of no consequence. As to different shades of red, you will get the shade of red that is passed by the filter.


What is it called when a liquid goes through a filter?

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