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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Eyes <strong>and</strong> brain process information<br />
• We figure out where an object is<br />
! from the direction light enters the eye...<br />
• We get color information from the light's wavelength<br />
• An object appears red if it emits red light (a traffic light…)<br />
! or if it reflects red light (an apple).<br />
Why is the sky blue…<br />
• It’s not that air has a bluish glow…<br />
• Air molecules scatter sunlight, particularly blue parts of the<br />
spectrum.<br />
• Blue light reaches us<br />
from all directions.
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