Question

The part of a shadow that receives light from some part of the source is called ________.

Answer 1

Penumbra

1. The brighter area that receives light from some part of the light source is called the penumbra.
2. The dark part of the shadow that light cannot pass through is called the umbra. Where the light source is completely blocked by the occluding body. An observer in the umbra experiences a total eclipse

Hence, The part of a shadow that receives light from some part of the source is called penubmra.