What are the characteristics of shadow ?

Hint: A shadow may be a dark area on a bright surface. it's caused by something blocking a source of sunshine . A shadow's outline, called a silhouette, will have an equivalent shape because of the object blocking the sunshine. To some extent a source of sunshine casts only an easy shadow, called an "umbra".

Complete answer:
Shadows are made by blocking light. Light rays travel from a source in straight lines. If an opaque (solid) object gets within the way, it stops light rays from traveling through it. This leads to a neighborhood of darkness appearing behind the thing .

Shadows are formed when an opaque object or material is placed within the path of rays of sunshine. The opaque material doesn't let the sunshine undergo it. The sunshine rays that go past the sides of the fabric make an overview for the shadow.

Characteristics of a shadow:
-It depends on the shape of the thing.
-It depends on the source of sunshine whether it's plane parallel rays or spherical.
-It depends on the position of the thing whether the thing is at infinite or finite distance.
-It depends on the position of the source of sunshine.

Note: A shadow is caused by an object blocking light in order that it doesn't reach a surface. the world in shadow appears black because there's no light falling on it--it appears dark. actually most shadows aren't totally black because light usually bounces round the obstruction off other objects.