A concave mirror forms a real image at 17.0 cm from the mirror surface along the principal axis. If the corresponding object is at ta distance of 36.0 cm, what isi the mirror's focal length?
let u be the object distance
let v be the image distance
v=17 cm
u=36 cm
1/f = 1/u + 1/v
= u+v
___
uv
so f=uv
____
u+v
= 17*36
_____
17+36
= 11.55cm
is this done correctly?
1 answer
Yes