Stewart, Balfour, 1828-1887 · Toronto : James Campbell · leaf 106
ircle 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 mil happen ? Thelens will act like a circular wedge; it is in trutha circular wedge, and being… … Fig. 36, Now suppose that when the sun is shining, you placea lens so as to allow the rays from the sun to strike itfull on the surface, these rays will be brought to apoint, or nearly so, on the other side of the lens; and ifyou place a sheet of paper at this point, you will see u HI. . H 98…
Physics
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