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
Point Source 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 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