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Question:

The magnification produced by a spherical mirror is -3. List four informations you obtain from this statement about the mirror/image.

Solution:

We know that linear magnification of a convex mirror is always +ive , the given magnification is -ive so
(1) It is a concave mirror
(2) Image is inverted
(3) Image is real
(4) As magnification = -3, which is greater than 1, therefore image is enlarged.