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+1 vote
117k views
in Physics by (51.7k points)

A real image, 4/5 size of the object is formed 18 cm from a lens. Calculate the focal length of the lens.

1 Answer

+1 vote
by (266k points)
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Best answer

Since the image is real and diminished, the lens must be convex and the object must be placed beyond 2F.

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