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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Cameras <strong>and</strong> telescopes<br />
• Cameras are the simplest “artificial” eyes...<br />
! film takes the place of your retina...<br />
• <strong>Telescopes</strong> can be thought<br />
of as large cameras...<br />
! bring light <strong>to</strong> a focus...<br />
! on some sort<br />
of detec<strong>to</strong>r...<br />
• As in eye, light entering from different angles…<br />
! is focused in different places on detec<strong>to</strong>r<br />
Lenses <strong>and</strong> mirrors<br />
• Lenses <strong>and</strong> curved mirrors described by focal length<br />
! distance from for parallel light rays <strong>to</strong> come <strong>to</strong> a focus<br />
f f<br />
! For both: more curved = shorter focal length<br />
• Telescope optics (without eyepiece) also have focal length<br />
! (effective) distance from primary mirror/lens <strong>to</strong><br />
location of focal point
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