Pencil shadow

Pencil shadow

C021/9931 Rights Managed

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Credit: GIPhotoStock/SCIENCE PHOTO LIBRARY

Caption: Pencil shadow. In this photo an extended light source is used to illuminate a pencil. The shadow cast by the lower part of the pencil is sharp and well defined. The shadow cast by the upper parts of the pencil are increasingly more blurred.

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Keywords: demonstration, education, educational, effect, experiment, extended, illumination, light, optical, optics, pencil, penumbra, physics, scientific, shadow, source, umbra

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