Question

Fill in the blanks: [5]

a. Red + _____ = White

b. Yellow + _____ = Yellow

c. White - _____ = Red

d. Cyan + Red = _____

e. Red + Blue = _____​

Answer 1

Answer:

(a) pink

(b) yellow

(c) When we unscrew the red floodlight (ouch, hot!), leaving only the blue and green, we see, effectively, white minus red, which gives cyan (turquoise in some books). When we remove the green light and leave red and blue, this gives white minus green, or magenta (purple in some books).

(d) Input red + green + blue (= white) is passed through:

Input red + green + blue (= white) is passed through:Yellow filter (stops blue) to give:

Input red + green + blue (= white) is passed through:Yellow filter (stops blue) to give:= Red + green (= yellow) light which is passed through:

Input red + green + blue (= white) is passed through:Yellow filter (stops blue) to give:= Red + green (= yellow) light which is passed through:Cyan (filter stops red) to give:

Input red + green + blue (= white) is passed through:Yellow filter (stops blue) to give:= Red + green (= yellow) light which is passed through:Cyan (filter stops red) to give:= Output: green