Question

A region of total darkness is called

• A. Penumbra
• B. Umbra
• C. Shadow
• D. None of these

Answer 1

The correct option is B

Umbra

Drawing the diagram of the situation:

The explanation for the correct option:

1. Umbra is the darkest region of the shadow.
2. It is the part of the shadow where all of the light from the source is blocked by the shadowing object.
3. It is formed using an extended source of light.

The explanation for the incorrect options:

A: Penumbra

It is the region around the umbra where the light from the source is partially blocked by the shadowing object.

C: Shadow

Shadow is the space that defines the absence of light.,or we can say, the place where no light reaches, is called the shadow.

Hence, option B is correct.