Maths, Physics Revision Physicss Maths Physics Physics A Level Physics Home Maths Maths Revision hut Light and colour Red,blue and green mixed produce white Light Blue and red mixed produce magenta Blue and green mixed produce  cyan Red and green mixed produce yellow  Cyan ,magenta and yellow are secondary colours When white light shines on a red object only red light is reflected all the other colours are absorbed Blue light light reflects form blue objects, the others are absorbed Colour filters work in a similar way In a red filter only red light passes through the other colours ate absorbed Only green light passes through a green filter, the others are absorbed Green and blue light passes through a cyan filter,the others are absorbed