Question

Equal amounts of different colors of light are shining on different color sheets of paper that are colored with pure pigments. For each of the described situations, select the color that the paper would appear to be under this light.

1. Red and green light on white paper
2. Blue Light on cyan paper
3. Red light on cyan paper
4. Green and Blue light on magenta paper
5. Red and Blue light on white paper

A. yellow
B. blue
C. magenta
D. white
E. red
F. black
G. cyan
H. green

Answer 1

SOLUTION:

COLOR MIXING:

• Red + Blue = Magenta
• Green + Blue = Cyan
• Green + Red = Yellow
• Green + Red + Blue = White
• Cyan + yellow = (Green + Blue) + (Green + Red) = White
• Magenta + yellow = White
• Cyan + Magenta = White

PART 1: Red and green light on white paper => Green + Red = Yellow

So answer is A. Yellow

PART 2: Blue Light on cyan paper (cyan paper absorbs red)

Net color = (B) - (R) = B

So answer is B. Blue

PART 3:  Red light on cyan paper (cyan paper absorbs red)

Net color = (R) - (R) = 0 = Black

So answer is F.Black.

PART 4:  Green and Blue light on magenta paper (Magenta paper absorbs green)

Net color = (G+B) - (G) =B = Blue

So answer is B. Blue

PART 5:  Red and Blue light on white paper (White paper absorbs no light)

Net color = (R+B) - (0) =R+B = magenta

So answer is C. Magenta