Sign Convention for Spherical Mirrors (Concave and Convex Mirrors) Distances are to be measured from the pole (vertex) of the mirror marked by point V in the figure. Distances measured along the direction of the incident ray are positive. In this convention, the pole (P) of the mirror is takenat the origin of X -Y coordinate system. III. The distance measured opposite the direction of … All the distances parallel to the principal axis are always measured from the pole of the spherical mirror. Shikha Goyal Feb 12, 2016 17:36 IST. Explain the sign conventions for reflection by spherical mirrors. Sign Convention for Reflection by Spherical Mirrors . The object is always placed on the left of the mirror. II. Convex mirror . The principal axis is taken as X-axis of the co-ordinate system. The conventions are as follows – (i) The object is always placed to the left of the mirror. 2. In a convex mirror the reflection of light takes place at the bulging-out surface or convex surface. The object is always placed to the left of the mirror. Reflection and Refraction of Light & Point of Incidence Sign convention in spherical mirror & Refraction through a Rectangular Glass slab. All distances are measured from the pole of the mirror. I) Write sign convention for reflection by spherical mirrors. Find the nature and the size of the image. Sign Convention for Reflection by Spherical Mirrors The new Cartesian sign convention is used for measuring the various distances in the ray-diagrams of spherical mirrors. According to the new Cartesian sign convention, the pole (P) of the mirror is taken as origin. 2. At what distance from the mirror should a screen be placed in order to obtain a sharp image? Term : Concave mirror . The sign conventions are as follows: 1. ii) An object, 5.0 cm in size, is placed at 30 cm in front of a concave mirror of focal length 15.0 cm. light must fall on the mirror from left to right. Sign conventions for reflection of light by spherical mirror are: 1. sign convention used for reflection of light by spherical mirror. : Sign conventions for spherical mirrors I. Objects are always placed to the left of the mirror i.e. 3. We will use the New Cartesian Sign Convention for the reflection of light by spherical mirrors.