Why is the grass green

Colour is not an absolute physical property of a surface but a function of the kind of light reflected by the surface. At dusk everything looks grey, but when the yellow street lights come on, the colours of things change quite significantly.

Living plants absorb light energy in the process of photosynthesis, enabling them to grow and bloom. It so happens that red and violet light are the most effective, and are absorbed, whilst green light is mostly reflected by leaves and grass. The green light we see is the light not used in photosynthesis.

Chlorophyl in plants reflects green light.
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