Stewart, Balfour, 1828-1887 · Toronto : James Campbell · leaf 108
rcle if viewed in onedirection, but if viewed endwise appearing like thefollowing figure. Such a piece of glass is called a lens. Nowlet a bundle of rays of light from a distancefall upon the lens. What will happen ? Thelens will act like a circular wedge; it is in trutha circular wedge, and being… … Now suppose that when the sun is shining, you place a lens so as to allow the rays from the sun to strike it full on the surface, these rays will be brought to a point, or nearly so, on the other side of the lens; and if you place a sheet of paper at this point, you will seeaHI - J ^ H 98 SCIENCE…
Physics
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