Fig. 8. Galileo's Telescope. A B, Convex lens;
C D, concave lens next the eye;
m n, real arrow; M N, apparent size of arrow; m'
m' and n' n' , end of the cones of
rays m and n as they reach the eye; M 0 N, angle
at which the magnified
arrow is seen.
[[This is Figure 8 from Arabella Buckley's A Short
History of Natural Science (1876), drawn for Buckley by Wallace.]]