Question

When an object is placed 8 millimeters from a concave spherical mirror, a clear image can be projected on a screen 16 millimeters in front of the mirror. If the object has a height of 4 millimeters, the height of the image is

A. 2 millimeters.
B. 4 millimeters.
C. 8 millimeters.
D. 12 millimeters.

Answer 1

The question can be answered by ratio and proportion by similar triangles u/v=Hi/Ho

8 : 16 = x : 4
8 / 16 = x / 4
16x = 32
x = 2

So the correct answer is letter A. 2 millimeters.