Question

(a) Point sources and extended sources
of light.
(b) Umbra and penumbra.

Explain the difference :​

Answer 1

Answer:

Umbra means ''shadow'' while ''penumbra'' means to hang on the shadow or almost a shadow. ... When a partial lunar eclipse occurs, the umbra merely covers a part of the moon. The outer shadow of the earth falls on the moon during a penumbral lunar eclipse.

Answer 2

Answer:

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Explanation:

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