The magnification produced by a mirror is 1/3 then the type of mirror is --------------. Explain why? Share with your friends Share 7 Somnath physics answered this Since, the magnification sign is positive, it means the image is virtual and erect. Since, the magnitude of magnification is 1/3 < 1, so, the image is diminished. This kind of image is formed by convex mirror. 10 View Full Answer Ashwin answered this it is convex as virtual and diminished image is formed only in convex mirrors. 2 Harsha Philips answered this itis concave as convex mirror only produces diminished image thumz up pls 1 Enrique Iglesias answered this h'/h=-v/u=1/3.as magnification is positive....itz a convex mirror...cuz...a positive sign in the value of m indicates that the image is virtual...AS.(-v/u=1/3 .... but u is -ve nd v is +ve fr images formed by convex mirror)...thus -(v)/(-u) =v/u. 11