A Newtonian telescope uses a concave parabolic primary and a flat diagonal secondary to send the converging beam to a side focus. The primary avoids on-axis spherical aberration, but has off-axis coma.

Ancestors (7)

  1. Reflecting telescope
  2. Optical telescope
  3. Optical instrument
  4. Optics
  5. Branch of physics
  6. Physics
  7. Home

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