How many of you can answer this?

Question

How many of you can answer this without looking it up they just know the answer. Her it is: What are the three primary colors of light?

Answer 1

Red green and blue.

But you should have added "visible to the human eye" to your question. Other species of animals often see additional, fewer, or different primary colors than we can.

Answer 2

red blue yellow

Answer 3

Red, yellow, and blue.

It's called a color wheel, people!

Answer 4

Red, green and blue.  It has to do with you your brain interprets how your eyes detect light.

Yet, apparently, some fraction of women have four kinds of color detectors in their eyes.  For them, there are four primary colors.

Answer 5

Light are additve colors, Red Blue and Yellow. Light is different than paint or ink...where it is magenta, Cyan and yellow.

Answer 6

Maybe this is wrong. Red, Yellow, Blue?

Answer 7

Reflective: red, yellow, & blue

Emissive:  magenta, blue, & green

Answer 8

red green and blue

Answer 9

RBG are the three colors that a CRT TV tube uses to recreate realistic scenes of real life.

Answer 10

Selena got it. They are red, green, and blue.

Answer 11

You're posting in an astronomy section so I'll go one step further.  When you look at lots of amateur astronomy pictures you'll often notice  specifications at the bottom of the picture; details of how long they did the exposure etc. --and also what kind of filters.  These are always identified as RGB in color pictures.  

RGB being the three colors that you need to make everything else, i.e., the primary colors.   Interestingly G is the most sensitive zone for the human eye looking into a telescope.

Anyhow if you look at a lot of astronomy pics it gets burned into your brain.  RGB no problem.  Usually the professional shots from Hubble or Keck don't have that information when released to the press, so it's mainly the photos taken by advanced amateurs that get you trained.  I am providing an example below.  L is for luminance.   I also provided a Hubble link that actually lets people play with colors and how they affect the final image.   A third site is an amateur explaining how all four factors luminance, red, green, blue go into making a picture.  

hope that helps,

GN

Answer 12

I can answer that : red, green and blue :)

Answer 13

additive: red, green, blue

subtractive: cyan, magenta, yellow