Optical refracting telescopes:
A refracting telescope uses lenses to focus the incoming light rays.
Most modern optical telescopes are reflectors rather than refractors, because:
Lenses suffer from chromatic aberration. Light waves of different wavelengths are bent by different amounts as they pass through the glass, so that each wavelength has a slightly different focus than the others.
It is harder to make and support a large lens than a large mirror.
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