Question

Why does penumbra form?

Answer 1

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Why does penumbra form?

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The penumbra is a half-shadow that occurs when a light source is only partly covered by an object – for example, when the Moon obscures part of the Sun's disk. The other 2 areas are: Umbra – the shadow's dark center portion.

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Answer 2

Explanation:

These form because while some of the light from the source gets blocked by the shadowing object, not all of it does

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