Question

why are shadows black in colour

Answer 1

Shadow is formed due to the absence of light which we call as black

(or)

Shadows occur when an object blocks the light falling on it so the light can’t reach the surface on the other side of the object. Shadows most often appear black because the visible light cannot make its way past the obstruction, if there is no light falling on an object then it will be black as there is no light to reflect. Shadows are very rarely completely black as there are usually reflections off surfaces and other light sources, which make their way into the shadowy area. As to why black is the absence of light, it just is and we have to accept that. We could delve into philosophy and talk about ‘does black look the same to me as it does to you?’ but since there is no way of knowing and experiencing things from other people’s immediate perspective, then we would really just be going around in circles. Coloured shadows can form if there are multiple coloured light sources or if the light goes through certain translucent objects such as stained glass windows, where only some of the light is blocked.

Answer 2

This happens because of Rayleigh scattering, the same property that causes the sky to appear blue. The opaque object is able to block the light of the sun, but not the ambient light of the sky which is blue as the atmosphere molecules scatter blue light more effectively. As a result, the shadowappears bluish.Not all shadows are black. When lights of different colors shine on the same spot on a white surface, the light reflecting from that spot to your eyes is called an additive mixture because it is the sum of all the light. We can learn about human color perception by using colored lights to make additive color mixtures.



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