Question

When does a concave mirror produce negative & positive magnification? ​

Answer 1

Answer:

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Explanation:

If m has a magnitude greater than 1 the image is larger than the object, and an m with a magnitude less than 1 means the image is smaller than the object. If the magnification is positive, the image is upright compared to the object; if m is negative, the image is inverted compared to the object.

Answer 2

Answer:

The magnification of a concave mirror is given by the ratio of the height of the image to the height of the object. Hence, if the image is inverted and real the magnification will be negative.

Distances above the principal axis are considered as positive and distances below the principal axis are considered as negative. Hence, if the image is real, the magnification is negative and if the image is virtual, the magnification is positive.