How can a flame have a shadow? #physics

Simply speaking, a shadow is formed where light is missing. But I was today years old when I found out you can categorize shadows to be unbra and penumbra.

Umbra: a dark shadow that is formed where no light falls

Penumbra: a light shadow that is formed where some light falls, but some has been absorbed or reflected away
#physics #science #vt.physics

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