Answer :

i) Given,


Focal length (f) =-18cm


Object length (u) =-12cm


Image length (v) =?


According to mirror formula,









Thus, the image formed is a virtual image at 36 cm behind the mirror.


ii) The position of the object (Murugan’s face) is of great importance as a concave mirror unlike a convex mirror forms different type of images depending upon the position of the object from the mirror.


Table: Summary of images formed by a concave mirror



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