![]() ![]() A viewer located in the penumbra region will see the light source, but it is partially blocked by the object casting the shadow. A viewer located in the umbra region cannot directly see any part of the light source.īy contrast, the penumbra is illuminated by some parts of the light source, giving it an intermediate level of light intensity. ![]() The umbra region does not receive any direct light from any part of the light source and is the darkest. The outlines of the shadow zones can be found by tracing the rays of light emitted by the outermost regions of the extended light source. This is known as the shadow blister effect. If two penumbras overlap, the shadows appear to attract and merge. The wider the light source, the more blurred the shadow becomes. For a non-point or "extended" source of light, the shadow is divided into the umbra, penumbra, and antumbra. A point source of light casts only a simple shadow, called an " umbra". ![]()
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