When you use the mirror equation--or the thin lens equation, the object distance is always positive. But, we can see that focal length of concave mirror is negative. This kind of mirror is known as a convex mirror. Generally the convex mirror has magnification greater than 1 and magnification of concave mirror has less than 1. Statement II: m = -v/u and convex mirror always forms virtual image. Assertion : Magnification of a convex mirror is always positive, but that of a concave mirror may be both positive or negative. Correct. It’s radius of curvature is also negative. (B) If both Statement - I and Statement - II are true but Statement - II is not the correct explanation of Statement – I. A convex mirror will always create a virtual image. Statement I : Magnification of a convex mirror is always positive .. It will also have a negative magnification. (A) If both Statement- I and Statement- II are true, and Statement - II is the correct explanation of Statement– I. Reason : It depends on the sign convention chosen. The paraxial parallel rays are focused on the right hand side of convex lens. In the case of the image height, a positive value indicates an upright image. Characteristics of Convex Mirrors. (a) Both A and R are true and R is the correct explanation of A (b) Both A and R are true but R is not correct explanation of A The focal length is positive for 'real focal points'--meaning light *actually* converges at the focal point, and is negative for 'virtual focal points'--light only *appears* to converge at a focal point. In the case of the image distance, a negative value always indicates the existence of a virtual image located behind the mirror. See, this distance f is measured in the direction of incident rays . Answer: The magnification is 1 Explanation: Magnification is defined as ratio to a image height to object height, which can be mathematically proven to be same as ratio of image distance to object distance.. Magnification of a mirror is used in many cases. My teacher also said that it would be positive but I have read in many places on the internet that it is negative. A convex mirror is also known as a diverging mirror as this mirror diverges light when they strike on its reflecting surface. According to the Cartesian sign convention, the focal length should be positive since the convex mirror forms a virtual image to the right of mirror (positive direction) when light comes from left. Hence, focal length of convex lens is positive. The passenger side mirror in every car is slightly convex. The nature of the image that a spherical mirror produces positive magnification is usually enlarged ... by a concave mirror will always be ... of linear magnification of a convex mirror. Virtual, erect, and diminished images are always formed with convex mirrors, irrespective of the distance between the object and the mirror.