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2015-04-01T21:38:48+05:30

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Magnification is 1/3.
since it is positive, image produced is virtual.
since it is less than 1, image is diminished.

A virtual diminished image is formed in case of convex mirror only.
So the mirror is convex.

(Note: concave mirror also produces virtual image but it is always enlarged)
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2015-04-01T23:51:41+05:30

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Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
M = 1/3 < 1  and erect image.

In a concave mirror,  magnification is -ve for inverted image.  Then the image can be  smaller than the object.  Magnification is positive but larger than 1, in case of a virtual and erect image.  So given mirror is not a concave mirror.

In a convex mirror, the image is always diminished with magnification < 1 and the image is always erect.  So m is positive.  Hence, the given mirror is the convex mirror.

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