1. Bodies that radiate light are called   opaque   luminous   non-luminous   Hint Half-n-half Clue   2. The partly lighted area of a shadow on the periphery of the totally shaded portion is called the _______   eclipse   umbra   penumbra   Half-n-half Clue   3. Light from the sun takes about _______ minutes to reach the earth.   four   six   eight   Half-n-half Clue   4. A _______ beam is one whose rays remain the same distance apart.   convergent   parallel   divergent   Half-n-half Clue   5. _______ is an instrument used to compare the luminous intensities of two sources of light.   Camera   Electroscope   Photometer   Half-n-half Clue   6. A _______ eclipse occurs when the moon comes between the sun and the earth.   lunar   solar   7. Materials that allow light to pass but through which objects cannot be clearly seen are said to be   opaque   translucent   transparent   Half-n-half Clue