science
posted by ashley on .
an object 5 millimeters high is loacated 15 millimeters in front of a plane mirror. how far from the mirror is the image located?

Can someone check me on this please.
the formula is:
1/d1 = (1/f)(1/d0)
where
d1 = image distance
f = focal length of the mirror(object height)
d0 = object distance from the mirror
giving you:
1/d1 = (1/15mm)  (1/5mm)
1/d1 = 0.1333333 recurring
take the inverse of this number giving:
d1(image distance) = 0.1333333^1
d1(image distance) = 7.5mm 
If it is a plane mirror the image appears to be as far behind the mirror as the object is in front.