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1. Types of Objects

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

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  1. 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

  2. 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

  3. 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

  4. 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

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