Question

1. Define umbra and penumbra with ray diagram.




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Answer 1

Umbra is the dark part while penumbra is the lighter part. ''Umbra'' is similarly defined as shade while penumbra means partial shade. ... 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

A lunar eclipse occurs when the Moon moves into the Earth's shadow. This can occur only when the Sun, Earth, and Moon are exactly or very closely aligned with Earth between the other two, and only on the night of a full moon. The type and length of a lunar eclipse depend on the Moon's proximity to either node of its orbit.