A convex and a concave mirror each of focal length f are placed co-axially. They are separated by 4f and their reflecting surfaces face each other. An object is kept on the principle axis at a distance x from the concave mirror such that the final image after two reflections, first on the concave mirror, is on the object itself. Find x in terms of f.
no.....first reflection is from concave mirror.....this img acts as object for the convex miror
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