what is the distance between spherical lens and black paper
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Explanation:
This question is basically incomplete.
What is the distance????
The difference are
1.Lens will allow heat to paas through it wheras black is a perfect absorber.
2. Lens can lit the paper wheras paper cannot be lit by sunlight directly.
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Answer:
THE DISTANCE BETWEEN THE SPHERICAL LENS AND THE BLACK PAPER IS CALLED ITS FOCAL LENGTH .
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