find the position of an object to be placed in front of concave having radius of curvature is 18 cm to get a real image double in size
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Answer: The position of the object will be between c and f.
Explanation:
because the the image is enlarged when the position of the object is between the radius of curvature ( - 18 cm ) and focal length ( R/2 = -18/2 = -9)
the focal length is negative because the image formed is real and inverted
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