Don't rly know how to explain, pls help tq.
Convex lens concentrates the light energy to one spot on the paper so that the heat energy accumulates on that one small spot of paper.
As the heat increases, combustion will occur when the spot becomes too hot & the paper burns.
1.The parallel rays of the sun will pass through the a
2. After entering the lens, the light rays is focused at the
principal focus of the lens
3. At the principal focus, the light ray is focused on one
4.Heat energy causes an increase in temperature, the
paper starts to burn
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