In: Physics
chp 22 q12
The magnification of a convex mirror is +0.53 times for objects 6.9 mm from the mirror.  | Part A What is the focal length of this mirror?  | 
Let 'X' be the object distance from mirror
According to magnification formula.m=-v/u....................................1
Where u is the object distance and v is the image distance
We have Mirror formula
..................................................................2
where f is the focal length




-----------------------------------------3
put equation 1 in 3 gives

given m=0.53 x






focal length of mirror is