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Q.

Where should a paper be placed from a convex lens of a focal length of $10 cm$ so as to focus sunlight on it?

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a

Behind the lens

b

In front of the lens

c

Convex lens does not focus the light

d

None of the above

answer is A.

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Detailed Solution

The paper should be placed behind the lens.
The centre of the convex lens is thicker than the edges. Two spherical surfaces typically make up an optical lens. If those surfaces are bent outward, the lens is referred to as a biconvex lens or a convex lens.
A real and inverted image of the object is formed at infinity when the object is kept at the principal focus of the convex lens. So, to get an infinite number of rays to the desired point on the paper, the paper should be placed behind the lens.

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