stance arereflected by the concave mirror to form an image p at itsprincipal focus. Before reaching p they fall on the plane mirrorand are reflected by it to form a real image pq, the imagein the plane mirror of pq. This image pq is at the principalfocus of a convex lens bac. After traversing this… … Fig. 114. 100-101] AIDS TO VISION. 165 the convex mirror is slightly oblique to that of the tube inwhich it is placed. Thus rays incident parallel to the axis ofthe tube are reflected somewhat obliquely. A real image ofP is thus formed at p and an eyepiece can be placed to viewthis image without…
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