The word "excellent" is written on a sheet of white paper with a red pencil and the work "good" with a green pencil. A green and a red pieces of glass are available. Through which glass can the word "excellent" be seen ?
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Sol. The green glass should be used. In this case the word will appear black against the green background of the paper, since the red colour of the word "excellent" does not pass through green glass.
If the red glass is used, the word written by the red pencil will not be seen against the red background of the paper.
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