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What was the primary material used in early telescope lenses?

GlassPlasticCrystalWood

Which advancement significantly improved the clarity of images in telescopes?

The invention of the achromatic lensThe introduction of digital technologyThe use of mirrors instead of lensesThe development of computerized tracking systems

Who is often credited with the major improvement of the telescope in the early 17th century?

Isaac NewtonJohannes KeplerGalileo GalileiHans Lippershey

Assessment

What was the primary material used in early telescope lenses?

Which advancement significantly improved the clarity of images in telescopes?

Who is often credited with the major improvement of the telescope in the early 17th century?