Question

What can you say about the edges of a shadow?

• A. They are always blurry.
• B. They are always sharp.
• C. The sharpness is high if the light is from a point source.
• D. The sharpness is low if the light is from a point source.

Answer 1

The correct option is C

The sharpness is high if the light is from a point source.

A shadow is a region where light from a light source is obstructed by an opaque object. When a single point source of light is present, the screen behind has a clear dark region. But, when multiple sources are present, a part of the screen is partially dark, and a part of the screen is completely dark. This causes the formation of blurred shadow.