Reflections from concave and convex mirrors with lighted arrow.

Reflections from concave and convex mirrors with lighted arrow. A lighted arrow object is placed in front of a concave mirror and an inverted (and enlarged) image of the arrow is focused on a distant screen. However, when the lighted arrow object is placed in front of a convex mirror only a virtual (and reduced) image can be seen, and no arrow image can be focused on a screen. Figure 1 is a ray diagram that shows how the virtual image is formed with the convex mirror. Figure 2 shows how the real image is formed with the concave mirror. The lighted arrow is the object 'o'. The center of curvature of each mirror is 'c', which is a radius r from the mirror. The focal point is 'f', which is r/2. The image, real or virtual, is labeled 'i'. The main equation showing the relationship between object distance, image distance, and focal length is 1/f = 1/o + 1/i, which is equivalent to 2/r = 1/o + 1/i. (f, r, and i are negative for the concave mirror.)