Because different colors of light are bent differently, a refracting telescope must use a special compound main lens which consists of at least two lenses of different shape and glass type to correct for this unequal bending (known as Chromatic Aberration).
(a refracting telescope; must use; a special compound main lens which consists of at least two lenses of different shape and glass type; to correct for this unequal bending) Context(a refracting telescope must use,List([56, 87))):(different colors of light; are bent differently; a refracting telescope) (a special compound main lens; consists; of at least two lenses of different shape and glass type)
a refracting telescope must use,List([56, 87))
a refracting telescope different colors of light a special compound main lens
must use are bent differently consists
a special compound main lens which consists of at least two lenses of different shape and glass type to correct for this unequal bending
a refracting telescope
of at least two lenses of different shape and glass type