A convex mirror forms a virtual, erect and diminished image of a real object; irrespective of the position of the object. Fig. shows image formation by a convex mirror.
An Important Note:
For solving problems using mirror formula, the following ‘guide lines’ are very use full.
(i) The positions of given parameter like object position, image position, focus etc. must be given their appropriate + or – sign in accordance with sign convention.
(ii) The position or size of the unknown parameter will be obtained using Eqn. (4) and (5). The sign and magnitude of unknown parameter must be properly intepretted.
The following table gives signs & their interpretation of commonly occuring parameters.
