Q.

Parallel rays of light, falling on a concave lens, appear to diverge from a point


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a

At infinity

b

At the focus

c

At twice the focal length

d

Between the focus and the lens 

answer is B.

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Detailed Solution

Parallel rays of light, falling on a concave lens, appear to diverge from a point at the focus.
For a beam of parallel light that is incident on the lens, it gets diverged outside. These spread-out rays meet virtually at one point called focus, forming a virtual image. Hence, the concave lens has a virtual focus for given parallel rays. A convex lens also converges a beam of parallel light rays at its focus, which is said to produce real focus.Question Image 
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