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प्रश्न
What is penumbra?
एका वाक्यात उत्तर
उत्तर
The less darker shadow formed penumbra.on the periphery of dark shadow is called penumbra.
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या प्रश्नात किंवा उत्तरात काही त्रुटी आहे का?
What is penumbra?
The less darker shadow formed penumbra.on the periphery of dark shadow is called penumbra.