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Q.

Is it true that when sun rays are focussed on a paper by a convex lens, it starts burning?


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a

True          

b

False 

answer is A.

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Detailed Solution

The above statement is true.
When the Sun's rays strike the convex lens, they converge to a point. Because the Sun's rays are nearly parallel, the image will always be formed at the primary focus. As a result, all of the rays come together in focus. These rays undoubtedly contain heat energy, which accumulates at that point. When parallel beams of rays from the Sun fall on a convex mirror, they, after refraction, fall at the focus. When a large number of rays gets concentrated in very less space, it produces intense heat, and thus the temperature of the paper rises, causing it to catch fire.
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