An object is kept at a distance of 4 m in front of a spherical mirror which forms its erect - Science - Light - Reflection and Refraction

Question

An object is kept at a distance of 4 m in front of a spherical
mirror which forms its erect image at a distance of 1 m from the
mirror What is the magnification ? Is the mirror concave or convex
?

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An object is kept at a distance of 4 m in front of a spherical mirror which forms its erect image at a distance of 1 m from the mirror. What is the magnification ? Is the mirror concave or convex ?