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First of all, we are able to see objects around us because they reflect the sunlight falling on them.

Sunlight is comprised of a full spectrum of colors including violet, indigo, blue, green, yellow, orange and red. The color of an object depends on which color of sunlight it reflects.

Now, strawberries have a pigment called anthocyanin. It absorbs all colors except red. It reflects red. Hence, strawberries appear red. Coal absorbs all colors and doesnt reflect any. So, it appears black.

The grass appears green because its cells have a special pigment called chlorophyll in them. Chlorophyll absorbs colors like red and blue, and mostly reflects green. As this reflected green color reaches our eyes, we perceive the grass as green.