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Question

A point object is kept at the focus of a convex lens

A
We will get a parallel beam of light
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B
We will get a convergent beam of light
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C
We will get a divergent beam of light
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D
Can't comment
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Solution

The correct option is A We will get a parallel beam of light
If the point source of the light is kept at the focus; we get a parallel beam of light. As a parallel beam, falling on a convex lens gets converged at the focus; we can think from the principle of reversibility.




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