Shadow, Umbra, and Penumbra

IMPORTANT

Shadow, Umbra, and Penumbra: Overview

This topic explains concepts such as Point Object in Optics, Extended Object in Optics, Shadows, Formation of Shadows Using Opaque Object, etc.

Important Questions on Shadow, Umbra, and Penumbra

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Explain penumbra.

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Differentiate between umbra, penumbra and shadow.

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 A(n)_____ is the part of the shadow where all of the light from the source is blocked by the shadowing object.

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Explain the formation of the umbra.

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A point source of light forms only the umbra region on the screen of a shadowed object.

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Among the following an example for extended source of light is

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Following are the examples for point sources of light.

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What is the nature of an image formed by a plane mirror when an extended object of height h is placed in front of the mirror?

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The given below diagram shows the formation of image of point object due to reflection at a plane mirror, Here OF=_____.

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In the diagram given below, the image formed is

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The image formed in the diagram given below is

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A point object can be considered as the source of light.

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Extended objects can be considered as the group of point objects in a ray diagram.

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Differentiate between shadow, penumbra and umbra. 

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Explain about penumbra.

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Penumbra is the inner part of the shadow.

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What do you mean by penumbra?

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The shadow of an object is always _____.

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The area where the penumbra falls experiences a _____ eclipse.

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Which is the darkest portion of the shadow?