Which of the following objects can not be a source of light__?

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Sun

Stars

Bulb

Glass

answer is D.

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Detailed Solution

Glass cannot be a source of light.
A light source is defined as an object that can emit radiations of light or light energy into the environment. Sun, stars, lightning and fireflies are natural sources of light. A natural light source produces naturally without human involvement and is also called a luminous object. And sources of light made up by humans or artificially are called artificial sources of light, like bulbs, oil lamps etc., and properties of an artificial source of light, like the speed of propagation, brightness, contrast, etc., can be changed externally. Among the others, glass is a type of material which allows light to pass through without any reflection, and it cannot be a light source.

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