Which telescope design innovation first allowed astronomers to eliminate chromatic aberration (color fringing) in observations, dramatically improving the clarity of astronomical images?

The telescope is one of astronomy's most transformative products, evolving dramatically since its invention. This poll explores how innovative product design has shaped astronomical discovery throughout history. Test your knowledge about a pivotal moment in telescope design that fundamentally changed how we observe and understand the cosmos. The answer reveals how thoughtful product innovation can transform an entire scientific field.

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The Newtonian reflector telescope, using mirrors instead of lenses
The achromatic refractor, using two lenses of different materials
The Galilean telescope, with a convex objective lens and concave eyepiece
The Schmidt-Cassegrain design, with a corrector plate and folded light path