Multiple choice

A red cross on a white background, when seen through a red filter,

  1. will appear as red cross on a white background

  2. will appear as red cross on a black background

  3. will appear as black cross on a red background

  4. will become invisible
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

A red cross on a white background, when seen through a red filter, will become invisible.

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