Find distance of image from the mirror

[ritwik06]

Homework Statement

The image formed by a convex mirror is only one third the size of the object. Focal length=12cm. Find distance of image from the mirror.

Please provide me with the equation of this problem. Please!

 

[drpizza]

Give a man a fish, and he'll have one meal to eat.

Teach the man to get his own fish, and he'll have plenty of meals to eat.
(or something like that.)

Have you tried searching Google for:
focal length convex mirror
??

(I don't mean to sound rude with this reply; however, the spirit in the homework section is not to just "provide" a solution.)

 

[weatherhead]

have you been taught "the lens equation" ? You can work out this problem using that. Or, draw a ray diagram

 

[ritwik06]

have you been taught "the lens equation" ? You can work out this problem using that. Or, draw a ray diagram

Please tell me the lens equation but its the case of a mirror.

 

[weatherhead]

ok, well try it the other way: think about the angles of incidence and angles of reflection... then it's a geometry problem :-D