What happens to light when it passes through a red filter?

Answer 1

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.

Answer 2

In effect, any colour light can be shone upon a red coloured filter by human control, but the filter will only filter through the red coloured light in the light shone upon it. For instance, if you activated a regular light bulb, placed a red filter just above it, and looked through the other side of the filter, the light bulb would appear red.

Answer 3

Assuming a pure frequency: The filter will not change the frequency of the light. Either some of the red light comes through - in which case it will still be red. Or it will completely filter out the light - in which case the result will be black.

Answer 4

A red filter will only allow light in the red wavelengths to pass through and will absorb (or reflect) the rest of the white light. The result is that only red light will come out of the filter.

Answer 5

All of the white light is absorbed by the filter, except the red part. The red comes out of

the other side, appearing to be red light, and causing the filter to look red. Which is a big

part of the reason why the filter is known as a "red filter".

Answer 6

Red light is coming through a red filter, that why it's red.

Answer 7

A red filter will allow red light to go through. Other colors are absorbed by the red filter and this process is called color by subtraction.

Answer 8

If the light is red, it sails right on through the filter. Otherwise, it gets absorbed in the dyes

between the layers of the filter, and it dies in the dyes.

Answer 9

Red

Answer 10

blue