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3) Explain the shadow obtainedsource ?from a point source and extender |
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Answer» A shadow formed by a POINT light source such as a flashlight is called an umbra. It is uniformly DARK and has sharp, well-defined edges. A shadow formed by an extended light source such as a FLUORESCENT light TUBE has a central dark umbra surrounded by a lighter penumbra region. The inner and outer edges of the penumbra are blurry and poorly defined. |
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