ve, or if a plane mirror isemployed a convex lens must be introduced between the mirrorand the source and adjusted to form an image of the globe onthe second lens through which the observer looks. Fig. 120 shews the arrangement when a concave mirror isused. L is the source of light, which may be an… … Fig. 120. refraction at the eye converge to form an image of the lens Aat B. This image, if the eye is normal, would be behind theretina. The retina is diffusely illuminated and some of thelight scattered from it emerges. The rays from any one pointsuch as P emerge parallel, and after again…
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