Question

which is front in concave mirror, which is back in convex mirror​

Answer 1

The focal length of the mirror is positive if the mirror is concave, so that the focal point is located in front of the mirror, and negative if the mirror is convex, so that the focal point is located behind the mirror.

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Answer 2

A concave mirror has a reflective surface that is curved inward and away from the light source. Concave mirrors reflect light inward to one focal point. Unlike convex mirrors, the image formed by a concave mirror shows different image types depending on the distance between the object and the mirror.

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