why shadows are always dark
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shadows are dark because they are those part where light don't reach as they are blocked by some thing.
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A shadow isnt always dark.
If there is a single light source, and the shadow is being cast by an opaque object between that lignt and the surface, the shadow will be black because no light is reaching the surface where it is blocked by the object.
If there are multiple light sources of different colors, then the shadow will be the color of any unblocked lights that gets to that surface minus any colors that surface absorbs (what you think of as "the color of the surface", a white surface absorbs no colors.)
If there are multiple white lights of different intensities then a shadow could show up as a darker but not black patch as it is only being illuminated by some but not all of the white lights.
Finally, if there is a single light passing through a translucent object, then the light that passes through is the color of the object (which is why we see it as the color it is when it is back-lit). The cast shadow (on a white background) will be the color of the object. This is, in fact, how colored spotlights had traditionally worked.
If there is a single light source, and the shadow is being cast by an opaque object between that lignt and the surface, the shadow will be black because no light is reaching the surface where it is blocked by the object.
If there are multiple light sources of different colors, then the shadow will be the color of any unblocked lights that gets to that surface minus any colors that surface absorbs (what you think of as "the color of the surface", a white surface absorbs no colors.)
If there are multiple white lights of different intensities then a shadow could show up as a darker but not black patch as it is only being illuminated by some but not all of the white lights.
Finally, if there is a single light passing through a translucent object, then the light that passes through is the color of the object (which is why we see it as the color it is when it is back-lit). The cast shadow (on a white background) will be the color of the object. This is, in fact, how colored spotlights had traditionally worked.
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