What do we call a substance through which we cannot see light ? Give an example of such a substance.
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A substance through which we cannot see light is called opaque. The examples of opaque substances are metallic sheets, black paper, etc.
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What do we call an electric bulb producing light?
What is a transparent medium? Give two examples.
What do we call a substance through which light passes? Give an example of such a substance.
Can a transparent medium form an image? Explain your answer.