refraction
It refracts four times.
If red light passed through the filter, then it would not be a blue filter. When a broad range of colors encounters the blue filter, by far the greatest share of the light that comes out of the other side is blue light, with very small amounts of other colors.
The reason that particular device is called a "redfilter" is that only red light cansurvive the trip through it and come out the other side, so that it appears red.Any other color of light is absorbed in the material that the filter is made of, andnever comes out.
Red or blue. The reason a red filter looks and is red, is because only red light comes through it, and the same can be said about a blue filter allowing only blue light through. Other colors are absorbed by the dyes in the filter. If white light enters a red filter, then red light comes out, and the same goes for blue.
The light comes out the other side. At the same time people all around the object are staring at it in amazement, nudging each other in the ribs, and exclaiming "Wow! Look at that! That object is transparent!"
Pure white light then it starts over on the other side of the universe.
No light will emerge from the different color paper, since all other colors except yellow have already been removed by the first one. The second one appears black.
Some of the light is reflected, some is absorbed by the glass, and the rest makes it all the way through and comes out of the other side. Since the glass is "frosted" or"ground", the light is scattered (bounces around) inside the glass, and doesn't follow a straight path. Although the light intensity and illumination survive the trip through it, images don't.
All other components of the white light, except magenta, are absorbed by the dyes in the filter, and only the magenta light comes out the other side. That's why the filter appears magenta when you look at it, and that's why the manufacturer cleverly named it a "Magenta Filter".
absorbed
All of the colors in the white, except the green, are absorbed by the plastic. The green is the only light that survives the trip all the way through and comes out the other side. This is the main reason the object is known as "a green bottle".
The reason the filter appears yellow and is called a "yellow filter" is that only yellow light survives the trip through the filter and lives to emerge from the other side. If you don't hit it with yellow light, nothing comes out. If the light hitting the filter is pure blue and nothing else, you'll see no light come out, i.e. black.