A mirror produces an image that is located 28.0 cm behind the
mirror, when the object is located 9.90 cm in front of the
mirror. (a) What is the focal length of the mirror? (b) Is the
mirror 1 - concave or 2 - convex? (Give the number of the
correct answer.)
The refractive indices of materials A and B have a ratio of
1/f = 1/do+1/do
for convex the answer is negative
for concave the answer is positive
is this correct formla?
1 answer