Shadows, Eclipses and 3D Movies

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Presentation transcript:

Shadows, Eclipses and 3D Movies

Shadows Umbra Penumbra Area of full shadow Cone shaped with base at object Penumbra Area of partial shadow Cone shaped w/ tip at object

Eclipses Occurs when one object moves into shadow of another Penumbra causes partial eclipse Umbra causes total eclipse Solar eclipse Moon between earth and sun Occurs during new moon Lunar eclipse Earth between sun and moon Occurs during full moon Color due to light passing thru earth’s atmosphere Why no eclipse each month?

Polarization Polarized light is light whose waves vibrate in only one direction Polarizing film selects components of light in films direction One polarizer 50% Crossed polarizers 0% E.G. light bouncing off horizontal surface (glare)

Uses of Polarization Sun Glasses 3D Movies Filters are vertical to block horizontal rays of glare Also decrease brightness by 50% 3D Movies Each eye must see its own view Opposite polarizers placed in front of two projectors matches corresponding glasses Switching polaroids produces inside out view