A red flower is painted on a white sheet of paper. What color will the flower appear to be when viewed through a red filter?

The flower will be invisible (almost indistinguishable) against the background of the canvas. The red flower reflects the rays of the red part of the spectrum, the white canvas reflects the rays of all colors. The red filter only transmits red rays. Therefore, the same rays from the flower and the canvas come into the eye of the observer who examines the canvas through the red filter.

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