(1) Five parts
(2) Four parts
(3) Two parts
(4) Three parts
Correct Answer : (4) In a solar or lunar eclipse, the region of earth’s shadow is divided into three parts.
An eclipse occurs when a star (such as Sun) aligns with two celestial bodies, such as a planet and a moon. The closer body casts a shadow that intersects the more distant body.
In a solar or lunar eclipse, the region of earth’s shadow is divided into three parts. The three parts are – Umbra, Penumbra and Antumbra.
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 of earth’s shadow 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 of earth’s shadow 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.
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