"Hence the image of the object, when reflected from the convex mirror, appears smaller than the object…
"To explain this, let us suppose that the arrow a, is diminished by reflection from the convex surface,…
"...as the arrow is moved backwards, the angle at c, must be diminished, because the rays flowing from…
"Suppose the object a, appears to the naked eye of the length repreesnted in the drawing. Now, as the…