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The book of stars; being a simple explanation of the stars and their uses to boy life, written to conform to the tests of the Boy scouts (1915)

Collins, A. Frederick (Archie Frederick), 1869- · New York, D. Appleton and company · leaf 153

An illustration from The book of stars; being a simple explanation of the stars and their uses to boy life, written to conform to the tests of the Boy scouts, 1915, leaf 153 — Fig. 145.—Prism Forming a Spectrum. and brightest the distance of this point from the lens is calledthe focal length. A concave lens is a lens which is thinner at the middle than … LENS EDGE OF SIDE VIEW OF CONVEX LENS CONVEX LENS Fig. 146.—Convex Lens. FOCUS it is at the edge, as shown in Fig. 147. It is used in small tele-scopes and opera glasses to turn the inverted picture formed SEEING THE STARS 135

Astronomy · Stars

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