Convex spherical mirror

According to UN R.46 the use of spherical convex mirrors is permitted. Such mirrors are defined by the radius of the sphere that specifies the shape of the spherical mirror surface with the reflective layer on the convex surface, leading to positive values for the radius. A spherical mirror has a surface with a constant and equal radius in all directions. For Class I and III, the radius is defined as rmin-or/mm = 1.2 m [1]. For the US market, FMVSS 111 only allows plane mirrors where rmin-orAnm is infinite on the driver s side. On the passenger s side FMVSS 111 allows a spherical convex mirror with a minimum radius of r irror/min = 0.889 m [2]. In addition, it is possible for the mandatory mirror to extend the field of view by using a aspherical mirror consisting of a spherical and an aspherical portion. In such cases the transition... 

A driver-side partially aspherical exterior mirror with a curvamre radius of 1260 mm (in the spherical section) and a passenger-side cylindrical convex exterior mirror were used as exterior mirrors. There was also a conventional interior mirror. 

The Offiier 1 1 reimager is aa off-ads, imobscored, reflective, all-spherical system consisting of two mirrors a large concave mirror, and a small convex mirror. It is free from all primary aberrations (Offiier 1975 Kingslake 1978). 

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