late the refractive index by observingthe angle of the prism and the minimum deviation even whenwe cannot trace the path of the ray graphically. * EXPERIMENT (14). To measure the angle of a prismoptically. Place the prism on the paper and draw its trace. Stick apin P (fig. 52) into the board at a… … Fig. 52. the pin by reflexion in it, placing the eye so that the imagecoincides as nearly as possible with the edge A of the prism.Stick two pins Q, Q into the board, so that these two pins andthe image are in a line. Join QQ cutting the face of the prismclose to A. Join PA ; the ray PA is…
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