Characteristics of Convex Mirrors. When you use the mirror equation--or the thin lens equation, the object distance is always positive. In the case of the image height, a positive value indicates an upright image. It’s radius of curvature is also negative. Hence, focal length of convex lens is positive. (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 A convex mirror is also known as a diverging mirror as this mirror diverges light when they strike on its reflecting surface. But, we can see that focal length of concave mirror is negative. In the case of the image distance, a negative value always indicates the existence of a virtual image located behind the mirror. Statement I : Magnification of a convex mirror is always positive .. Assertion : Magnification of a convex mirror is always positive, but that of a concave mirror may be both positive or negative. 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. My teacher also said that it would be positive but I have read in many places on the internet that it is negative. (B) If both Statement - I and Statement - II are true but Statement - II is not the correct explanation of Statement – I. 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. 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. 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. (A) If both Statement- I and Statement- II are true, and Statement - II is the correct explanation of Statement– I. Statement II: m = -v/u and convex mirror always forms virtual image. A convex mirror will always create a virtual image. Reason : It depends on the sign convention chosen. It will also have a negative magnification. Virtual, erect, and diminished images are always formed with convex mirrors, irrespective of the distance between the object and the mirror. See, this distance f is measured in the direction of incident rays . Generally the convex mirror has magnification greater than 1 and magnification of concave mirror has less than 1. This kind of mirror is known as a convex mirror. Correct. The paraxial parallel rays are focused on the right hand side of convex lens. 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