If you pass light through a yellow and blue filter, will you see green? Why or why not?

Answer 1

Unlike our contemporary primary colours of paints, red blue, yellow, in the world of light, the primary colours are blue, red and green.

For secondary colours:
If you have blue and red light, you get magenta,
A mix of blue and green is cyan
and a mix of red and green is yellow.

So if you have white light (which is a combo of all the light colours) first meeting a yellow filter, it will block everything but yellow (which is a combo of red and green).

So after going through the yellow filter, red and green light are still passing through

When it hits the blue filter, it blocks everything except blue. Since red nor green are not blue, it will not allow any light to pass through.

So what you see is no light passing through.

Answer 2

Blue and yellow filters are examples of edge pass filters. A blue filter transmits light with wavelengths shorter than 500 nm and a yellow filter transmits light with wavelengths longer than 500 nm. Because the transitions are not abrupt, a small amount of light within 10 nm either side of 500 nm will leak through and will appear blue green. If band pass filters are used, the answer will be different. Band pass filters are specified by central wavelength CWL and full width at half maximum FWHM. A reasonably good band pass filter has a FWHM of 10 nm. That is, most of the radiation is blocked more than 5 nm from the central wavelength. Blue and yellow are separated by 80-100 nm, which is more than the potential overlap region. Therefore no light would pass through two such band pass filters in series.

Answer 3

No. Green is what you get when you COMBINE blue and yellow, not when you take them away. But you didn't specify the starting color of the light. So the answer of what you will get is not possible given the information you gave. For instance, what if you STARTED with just green... and you filtered out both components?

But I can say no, you will NOT see green, for reasons given.

Answer 4

A filter allows one color of light tto go through. A yellow filter allows yellow light through only. A blue filter allows blue light through only. So if light goes through a yellow filter, you have yellow wavelengths only. They can not go through a blue filter so you see black, the lack of light.

Answer 5

No.
Because there filters. They filter out the colors yellow and blue, which are the colors that when combined make green.