A concave mirror forms a real image. The object and image positions are interchanged after the object is moved. If the initial magnification magnitude is 3, the ratio of the two object distances is:
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A concave mirror forms a real image. The object and image positions are interchanged after the object is moved. If the initial magnification magnitude is 3, the ratio of the two object distances is:

G1 Physics · Accepted Answer

Initial v=3u. In the conjugate swapped position, the new object distance equals the old image distance, so u₁:u₂=1:3.