a convex lens forms a real image of a point object at a distance of 15 cm from the convex lens. A concave lens is placed 10 cm behind the convex lens on the image side. On placing the plane mirror on the image side and facing the concave lens, it is observed that the final image now coincides with the object itself. The focal length of the concave lens is?
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Answer:
ans is focal length is 15cm
Explanation:
how ever in real que the image is formed at distance 50cm but procedure is same
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