For doing the experiment it is advisable to use a piece of wood or hard cardboard in the place of paper. Because
For doing the experiment it is advisable to use a piece of wood or hard cardboard in the place of paper. Because
A) Paper is costlier
B) White sheet of paper is not easily available
C) When sun rays from a distant object are focused on a sheet of paper, it may start burning
D) None of the above reasons
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C) When sun rays from a distant object are focused on a sheet of paper, it may start burning
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