Light, Optics and Telescopes Trip to Lick Observatory
Light, Optics and Telescopes Trip to Lick Observatory
Light, Optics and Telescopes Trip to Lick Observatory
You also want an ePaper? Increase the reach of your titles
YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.
Wave fronts <strong>and</strong> light rays<br />
• Waves travel circularly<br />
(spherically) from source<br />
! light “rays” show<br />
direction of travel<br />
• If source is distant…<br />
! wavefronts are flat<br />
! light rays are parallel<br />
Why are distant objects hard <strong>to</strong> see?<br />
• They are faint<br />
! light spreads out as it<br />
travels from source<br />
• They are small<br />
! angular size is small
Change language