"let two plane mirrors are inclined at an angle theta.
total deviation produced from two inclined plane mirror after two successive reflection is given by delta=360-2theta
the number of images formed n=(360/theta)-1, if (360/theta) is even integer..
if (360/theta) is odd integer, the number of images formed n=(360/theta)-1 when the object is kept symmetrically, and n=(360/theta) when object is kept asymmetrically..
if (360/theta) is a fraction, the number of images formed is equal to its integral part..
how do we get these relations"