Question

why does a converging lens behave like as a burning glass?

Answer 1

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Convex lenses focus parallel light rays from distant sources such as the sun to a single point on the principal axis of the lens. This point is called the principal focus of the convex lens. A source such as the sun is producing enough energy to heat a substance if it is placed at the principal focus point....


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Answer 2

Moreover, refractive index is a relative term meaning one medium is denser/rarer than the other medium is based on the other medium entirely.
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