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 Point Source 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 central UMBRA 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