Merchant, F. W. (Francis Walter), 1855-1937, Chant, Clarence Augustus, 1865-1956 · Toronto : Copp Clark · leaf 346
Fio. 392.—Waves expanding from P are changed by the lens intocontracting spherical waves. lens, and on emerging they are concave, but they do not convergeas rapidly as in the tirst case. In Fig. 393 is shown the effect ofa concave lens. The outer portionsof the lens being thicker than thecentral,… … Fio. 393.—Waves going out from P aremade more curved by the lens, andappear to have P as their centre. These results are further illus-trated in a striking and beautifulmanner by using an air lens inan atmosphere of water. Such a lens can be constructed withoutdifficulty by cementing two…
Physics
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