Which telescope design innovation, first successfully implemented in 1668, solved the chromatic aberration problem that had plagued early refracting telescopes?

The astronomy industry has seen remarkable innovations in telescope design that have transformed our understanding of the cosmos. From simple refracting telescopes of the 17th century to today's sophisticated observatory instruments, the evolution of astronomical equipment represents one of humanity's greatest technological journeys. This poll tests your knowledge about a pivotal moment in telescope design history that fundamentally changed astronomical observation and research.

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The Newtonian reflector design using mirrors instead of lenses
The Galilean dual-lens system with variable focal length
The Cassegrain compound telescope with corrector plate
The Kepler achromatic doublet lens configuration