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Question

To see a non-luminous object, light from an ____ source is required.

A
external
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B
internal
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C
infinite
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D
None of the above
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Solution

The correct option is A external
We see objects only when light from the object falls on our eye. For non luminous objects (like table, book etc) to be visible, there has to be an external source of light whose light falls on the object, and then gets reflected back towards our eyes.

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