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OPTICAL TELESCOPES - Coggle Diagram
OPTICAL TELESCOPES
Atmospheric Effects
Seeing (blur from turbulence)
Scintillation (twinkling)
Extinction (dimming)
Refraction (bending of light)
Angular Resolution
θ ≈ 1.22 λ / D
Smaller θ → better resolution
Limited by diffraction
Types of Telescopes
Refracting (lenses)
bends light
problems: chromatic aberration
Reflecting (mirrors)
no chromatic aberration
most modern telescopes
Catadioptric
lenses + mirrors
Aberrations (image problems)
Chromatic (colors separate)
Spherical (imperfect focus)
Coma (distorted edges)
Detectors
CCD (modern)
High efficiency
Convert photons → signal