into Parallelism and diverge no more. For then those Rays will recompose
a beam of white Light XY. If the refracting Angle of either Prism be the
bigger, that Prism must be so much the nearer to the Lens. You will know
when the Prisms and the Lens are well set together, by observing if the
beam of Light XY, which comes out of the second Prism be perfectly white
to the very edges of the Light, and at all distances from the Prism

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