It is usually stated that Newton was the first to distinguish seven colours in the prismatic spectrum ... Mirrors, Prisms, and Lenses: a Text-book of Geometrical Optics. Prof.
AC adaptor is also available as an optional accessaries. An optional prism compensator is also available to measure the prismatic lens from 5 prism diopter to 14 prism diopter in 1 diopter step.
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