a convex lens forms a real image 4 times magnified at a distance of 60 CM from the lens . calculate the focal length and power of the lens . draw a ray diagram also , to reprsent this situation .
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a convex lens forms a real image 4 times magnified at a distance of 60 CM from the lens . calculate the focal length and power of the lens . draw a ray diagram also , to represent this situation .
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