define the principal focus of a convex mirror
it cn b..lik diss--wen d rays r ll to the principle ....in a convx mirrr..they ''appear''' 2 diverzz 4m a point..and d point is calld--principle focus...........
define the principal focus of a convex mirror
it cn b..lik diss--wen d rays r ll to the principle ....in a convx mirrr..they ''appear''' 2 diverzz 4m a point..and d point is calld--principle focus...........