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Class 10 > Learn Science > Why paper catches fire when a convex lens is used to...
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Why paper catches fire when a convex lens is used to ficus sunlight?

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covex lens concentrate the sun rays onto a small area, which heats up the area, then the exposed surface will ignited, {it is a converging lengs, that is it will converge the rays falling on it into single strong beam.
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As convex lens are convergent ,they focus all the rays at single point on paper. Due to intense heat at a point the paper burns
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A convex lens focuses sun light at a point on the paper. The photons in the sun light have energy. These are concentrated at one point and a lot of heat is generated. As there is combustible material (paper), oxygen ( in the air) and the heat energy raises the temperature at the focal point to over the...
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A convex lens focuses sun light at a point on the paper. The photons in the sun light have energy. These are concentrated at one point and a lot of heat is generated. As there is combustible material (paper), oxygen ( in the air) and the heat energy raises the temperature at the focal point to over the flash point for paper, a fire starts read less
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As convex lens are convergent ,they focus all the rays at single point on paper. Due to intense heat at a point the paper burns
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Because convex lense concentrate all the incident sun light and focus it on a point and increase the intensity of light which causes fire on that focus point
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