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Why paper catches fire when a convex lens is used to ficus sunlight?

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CBSE/Class 10/Science Tuition/Class IX-X Tuition

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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... read more
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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Tutor

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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