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Discoveries and inventions of the nineteenth century (1905)
Routledge, Robert · London : G. Routledge and Sons · leaf 653
below the lens the concentric prisms, c e and/y, which, by re-fraction and total reflections (see page 399), send the rays parallel to the axisof the lens. Fresnel also contrived methods of economically grinding suchlenses and prisms with precision. Fresnel saw that it would be useless to apply… … |io)©©@ @ @ <0) (Q) ^ (Q) @) @) ©©@©®jInventions
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