Question

A beam of light converges at a point P. Now a lens is placed in the path of the convergent beam cm from P. At what point does the beam converge if the lens is (a) a convex lens of focal length cm, and (b) a concave lens of focal length cm?

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Solution
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. According to the given case, object is virtual,
The focal length of the convex lens is .
Using lens equation,




. Now the focal length of the concave lens,




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