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List out the difference between a point ...

List out the difference between a point source and an extended source of light.

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`{:("Point source of light ","Extended source of light"),("It is point size source","It has dimension"),("It casts only umbra on the secreen for an opaque object.","It cast both umbra and penumbra for an opaque object"),("Examples Light emitting from a pin hole aperture.","Examples : A burning candle, a glowing tube light."):}`
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