Laurence, Lionel · London, School of Optics · leaf 18
Light (Fig. 5) is passed through a slit S and alens L on to a plane mirror Mv whence the light passes to a concave mirror M2placed at a distance equal to its radius. From M2 the light is again reflectedback to Mx and retracing its path is partly reflected by the glass plate M3 tothe eye at T. If M,… … Fig. 5. same spot on the mirror M3. Thus the image seen by the observer throughthe telescope will not be formed on the cross wires at a, but will be foundshifted to some point b. If the speed be known at whicb the mirror M1is rotated, and the distance which the light has to travel from Mx to M2…
Optics
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