red filter
green
Black, because the blue light would be absorbed into the object's pigment and as there is no green light to reflect, the object would appear black.
green
The object will appear to be blue. However, the object would be indistinguishable from an object that reflects all colors of light. If yellow light were shone on an object that reflects only blue wavelengths, the object would appear to be black.
black.
grey
the colors are mixing, and it should actually look purple, but appears to be black. (its like mixing paint in a way...)
In red light a blue object appears black because there is no blue light for it to reflect, while black resembles the absence of all color.
Black because if a red light reflects off the blue surface there is no reflection, so the surface looks black.
Black because if a red light reflects off the blue surface there is no reflection, so the surface looks black.
Light is really all the colors of the rainbow for example if and object is blue it absorbs all colors except blue so a white object would look white because it REFLECTS all the colors of the rainbow a black object looks black because it ABSORBS all the colors
Since the filter allows only blue light to pass through, anything you see through the filter appears either blue or black. Blue if there's any blue light coming from it, or black if there isn't any.