Simple Mirror question whats wrong?
Ok the question is from Schaum's outline:
How far should an object be from a concave spherical mirror of radius 36 cm to form a real image one ninth its size?
I come up with 1.8 meters the book has .18 meters. My work:
focal point = 18 cm All real images on this mirror are inverted thus from transverse magnification formula the distance of the image is the object distance divided by 9 (i= s/9).
Thus we get 1/s + 9/s = 1/18 which implies s (object) = 180 cm, which is 1.8 m.
What am I doing wrong?
