1. An object 5 millimeters high is located 15 millimeters in front of a plane mirror. How far from the mirror is the image located?
A. 5.0 millimeters
B. 7.5 millimeters
C. 15 millimeters
D. 30 millimeters
C. Assuming a plane mirror.
5.0millimeters
To find the distance of the image from the mirror, we can use the mirror equation: 1/f = 1/d_i + 1/d_o, where f is the focal length of the mirror, d_i is the distance of the image from the mirror, and d_o is the distance of the object from the mirror.
However, for a plane mirror, the focal length is considered to be infinite. This means that the parallel rays of light that hit the mirror will appear to diverge as if they came from a point behind the mirror at the same distance as the object in front of the mirror. In other words, the distance of the image from the mirror is equal to the distance of the object from the mirror.
Therefore, in this case, the distance of the image from the mirror is also 15 millimeters.
So the correct answer is C. 15 millimeters.