p clear image of theslit is formed. An object, such as one of the upright rodsused in Experiment (17), can be viewed with half the eye byholding the prism so as to cover only half the pupil, and canbe placed, by a second observer, so as to coincide with theposition of the yellow virtual image. It… … Fig. 128. 1 Strictly speaking, the prism is not accurately in a position of mini-mum deviation for all the colours at the same time, but it is very nearly so. 186 LIGHT. [CH. IX virtual images, each differently coloured, arranged side by sidein a line. In fig. 128 ABC is the prism, 8 the slit, SP,…
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![An illustration from Essai de physique, par Mr. Pierre van Musschenbroek ... avec une description de nouvelles sortes de machines pneumatiques, et un recueil d'expériences par Mr. J. v[an] M[usschenbroek] Traduit du hollandois par Mr. Pierre Massuet .. (1751)](https://img.insideoutlibrary.com/img/200/ia-essaidephysiquep02muss-78-23.webp)
