what a shadow does when it moves closer to a light source?

Question

its a science question

Answer 1

This can be taken two ways:
If the light source that is part of the shadow creation moves closer to the object that is generating the shadow, than it will intensify as less refraction takes place in the air surrounding the object (diluting the shadow).

If however we are talking two light sources, one stationary creating the shadow, and another secondary moving "closer" to the shadow,

Then the shadow will either "lighten" or disappear in it's entirety and a new "shadow" will appear.

Assume source A is creating your shadow, and source B is the new source.

If A is stronger than B, your shadow will lighten, but not disappear.
If Source B is stronger than A, your shadow will disappear and reappear on the far side of the object.
If Source A and B are equivalent and equidistant, than you will have no shadow. (It will be hard to see it even if they aren't equal distance due to the limited gain from aerial refraction)

Answer 2

if the object is as wide as the light source or larger, the shadow will grow proportionaly. if it is smaller, though, the umbra (completely dark spot) will decrease while the prenumbra (light shadow) increases.

Answer 3

grows in length but narrows in width.

Answer 4

It becomes bigger