he bhagwan ye org.....

SIMPLE AXIS OF SYMMETRY:

step 1 take a line passing from centre of symmetry
step 2 make that line your viewing line and make the the body two dimensional
step 3 now your line will act as centre of symmetry for the new structure
step 4 try to find out a plane of symmetry containing this new plane of symmetry and perpendicular to the 2D figure you form

ifu are able to find any then the line u have taken will be line of symmetry for the original structure and the number of plane u ca get will be its FOLDEDNESS

ALTERNATING AXIS OF SYMMETRY

step 1 take a line passing from centre of symmetry
step 2 make that line your viewing line and make the the body two dimensional
step 3 now your line will act as centre of symmetry for the new structure
STEP 4 rotate your 2D figure by any angle( although it is said that it should in the form of 360/n)
step 5 try to find out a plane of symmetry parallel to this new plane

if u can find one then the axis choosen will be your alternating axis of symmetry
and one more point to remember :

absence of alternating axis of symmetry is the necessary and sufficient condition for a molecule to exhibit optical activity.

vah! gaurav bhaiya............[1][1]