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When an object is placed normallyon the principal axis of a spherial mirror at a distance 'a' from its pole, its image is formed at a distance 'v' from the pole of mirror such that (1)/(v)+(1)/(u)=(1)/(f), where f = focal length of given mirror. The relation is called mirror formula and is true for all types of mirrors under all conditions. However, values of u, v and f must be put with proper signs are per the sign convention followed. If 'h' be the height of the linear object and h' the height of image, then ratio (h')/(h) is called linear magnification or lateral magnification and its value m is given as : m=(h')/(h)=-(v)/(u) A small match box lies along the principal axis of a concave mirror and one end of match box is at centre of curvature of the mirror. Draw a ray diagram to show its image. Is its magnetification uniform? |
| Answer» Solution :Ray diagram Fig. 9.13 is SHOWN here. A. B. is the image of the match box AB. Its MAGNIFICATION is non - UNIFORM i.e., the image is distored. | |