Preston, Thomas, Joly, Charles Jasper, 1864-1906, Parsons, John Herbert, Sir, 1868-1957, donor, University College, London. Library Services · London : Macmillan and Co. · leaf 155
EXAMPLES 131 ART. 84 of a right-angled prism ABC, resting on a horizontal table AB fur- nished with a small hole to receive the drop. The drop is viewed through the face AC of the prism by means of a telescope T pivoted at the centre of a graduated circle, which slides on a vertical rod fixed … / ^ . Fig. 78. side of the prism are totally re- flected. The telescope is now fixed, and its inclination {d) to the vertical is observed. In this case NDM is the critical angle a, and NMD = 90 - a, while TMO = 90 - 6*. But the refractive index of the glass is given by sin TMO cos e ^ ~ sin NMD ~…
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