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6 April, 02:47

An actress wears a blue dress. How could you use spot lights to make the dress appear to be black?

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  1. 6 April, 03:17
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    Use a yellow (Red + Green) spotlight to make it look black.

    Explanation:

    The blue fabric has pigments that can absorb the red and green light. This light is incident on the fabric, therefore, there is no light left to be reflected back, so, at plain sight, the dress will look black.
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