1. A _______ beam is one whose rays remain the same distance apart.   parallel   convergent   divergent   Hint Half-n-half Clue   2. Light always travels in straight lines.   True   False   3. Bodies that radiate light are called   non-luminous   luminous   opaque   Half-n-half Clue   4. A lunar eclipse occurs when the earth comes between the sun and the moon.   True   False   5. The partly lighted area of a shadow on the periphery of the totally shaded portion is called the _______   eclipse   penumbra   umbra   Half-n-half Clue   6. A _______ eclipse occurs when the moon comes between the sun and the earth.   lunar   solar   7. If the power of a light source is measured in candelas and distance in meters, then the illuminance of the surface is in   Lux   Joule   Watt   Half-n-half Clue