Question

for the positive maginification produced by concave mirror the position of the object should be
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Answer 1

Answer:

Magnification of a concave lens or a convex mirror is always positive because they always form virtual and erect images. ... Positive magnification for virtual images and negative magnification for real images is true only when a single optical device is used.

Answer 2

Answer:

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Magnification of a concave lens or a convex mirror is always positive because they always form virtual and erect images. ... Positive magnification for virtual images and negative magnification for real images is true only when a single optical device is used.

AND

concave mirrors have positive f and convex mirrors have negative f. for magnification, positive values indicate that the image is the same orientation as the object (object upright, image also upright), negative if the image is inverted relative to the object.

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