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21. When green glass is placed between the flashlight and the white movie screen (see attached diagram), a green spot appears on the screen. If green glass and red glass are placed between the flashlight and the movie screen (as shown on the right below), what will happen to the spot?

(a) It will be green.
(b) It will be yellow.
(c) It will be brown.
(d) It will be red.
(e) It will disappear.

What is the correct answer?

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This solution provides te best answer and explanation for this question: When green glass is placed between the flashlight and the white movie screen (see attached diagram), a green spot appears on the screen. If green glass and red glass are placed between the flashlight and the movie screen (as shown on the right below), what will happen to the spot?

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21. When green glass is placed between the flashlight and the white movie screen (see attached diagram), a green spot appears on the ...

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