The darkest portion of the shadow cast during an eclipse is ?

(1) Corona
(2) Umbra
(3) Penumbra
(4) Black hole

Correct Answer : (2) The darkest portion of the shadow cast during an eclipse is Umbra.

Explanation:

The umbra, penumbra and antumbra are three distinct parts of a shadow, created by any light source after impinging on an opaque object. Assuming no diffraction, for a collimated beam (such as a point source) of light, only the umbra is cast.

The umbra is the innermost and darkest portion of the shadow cast during an eclipse, where the light source is completely blocked by the occluding body. The word ‘umbra’ means ‘shadow’ in Latin. The darkest portion of the shadow cast during an eclipse can be observed during total eclipse.

The penumbra is the region in which only a portion of the light source is obscured by the occluding body. An observer in the penumbra experiences a partial eclipse.

The antumbra is the region from which the occluding body appears entirely within the disc of the light source. An observer in this region experiences an annular eclipse, in which a bright ring is visible around the eclipsing body.

See Also

Reference

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