has been working through Don's worksheet book and with Don via email, for about 8 months.
In chapter 6 there is a diagram of hinged mirrors at left, below. Students are
asked to look between the mirrors to see how many images of a red rod, say, that
they see with the mirrors open at an angle of 90o (3
+ the original=4).
the diagram at the right below, using an angle of
the mirrors, and
proceeded to show the path of the light
rays as they leave the red rod,
bounce off the mirrors (the angle of
incidence equals the angle of
reflection) and to go to the eye, He also found
the 6 images (5+original=6); and they
all lie on the same circle!
there is a rule here: the number of images*the angle between the mirrors = 360