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1. Types of Objects. Transparent All light of certain wavelengths to pass through them without scattering or absorption Often objects just transparent to specific wavelength of light Ex: green bottle transparent to green light but may not be transparent to other colors. B. Translucent
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1. Types of Objects • Transparent • All light of certain wavelengths to pass through them without scattering or absorption • Often objects just transparent to specific wavelength of light • Ex: green bottle transparent to green light but may not be transparent to other colors
B. Translucent • Allows light to pass through but diffuses or scatters some of it • Ex: frosted glass – rays of light hitting glass are scattered as they pass through • Opaque • Do not transmit light; no light passes through
2. Shadows • formed when light from a source is intercepted by an object • forms behind object • appearance depends on object’s shape, composition, size, and the position of the light source • PointSource produces shadows with clearly defined edges • Called an UMBRA • Ex: Stars
Shadows continued…. e. Large, nearby light sources produce shadows with fuzzy edges • two regions – • dark centralUMBRA • light, outer shadow – PENUMBRA f. Multiple light sources produce multiple shadows g. # of shadows = # of light sources h. ECLIPSES: largest shadows; occur when one planetary body passes through the shadow of another • Lunar eclipse: Sun, Earth, and Moon lie in a straight line and Earth’s shadow falls on the Moon. • Solar eclipse: Moon comes between Sun and Earth, placing part of Earth in the Moon’s shadow