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A beam of light converges at a point P. ...

A beam of light converges at a point P. Now a lens is placed in the path of the convergent beam 12cm form P. At what point does the beam converge if the lens is a) convex lens of focal length 20 cm, and b) a convex lens of focal length 16cm?

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real, at 7.5cm same side as P,
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  10. A convex lens of focal length 15 cm and concave mirror of focal length...

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