Light, Optics and Telescopes Trip to Lick Observatory
Light, Optics and Telescopes Trip to Lick Observatory
Light, Optics and Telescopes Trip to Lick Observatory
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Optical telescopes <strong>and</strong> “seeing”<br />
• Angular resolution of optical telescopes on Earth is limited<br />
! by changing atmospheric refraction<br />
! not diffraction<br />
• The effect that makes stars twinkle blurs telescope images<br />
Twinkling…<br />
• Stars twinkle because…<br />
! angular size of star is very small % …<br />
! smaller than “bouncing”<br />
due <strong>to</strong> seeing<br />
• Angular size of planets is larger…<br />
! they are blurred by seeing….<br />
! but don’t seem <strong>to</strong> twinkle<br />
% Stars look point-like through a telescope even with very<br />
high magnification
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