Replace the filter, then turn off the light.

It depends on what kind of filter it is. A blue light filter, will cause the image appear to be bluer, while a red light filter will make the image reddererrr... ^^

A red filter will absorb all but the red wavelength of light. A blue filter absorbs all but blue light. So the blue filter will absorb the red wavelength and no light will shine through.

what happens when light enters a polorizing filter?

A cyan filter will pass green light.

In fact, you could pass the light through a cyan filter AND a yellow filter and it would be unchanged.