1. Non-luminous bodies become visible when they _______ light into our eyes.   reflect   radiate   refract   Hint Half-n-half Clue   2. Light from the sun takes about _______ minutes to reach the earth.   four   six   eight   Half-n-half Clue   3. Bodies that radiate light are called   opaque   non-luminous   luminous   Half-n-half Clue   4. A lunar eclipse occurs when the earth comes between the sun and the moon.   True   False   5. _______ is an instrument used to compare the luminous intensities of two sources of light.   Camera   Electroscope   Photometer   Half-n-half Clue   6. A _______ beam is one whose rays remain the same distance apart.   parallel   divergent   convergent   Half-n-half Clue   7. Materials through which objects can be seen clearly are said to be   translucent   transparent   opaque   Half-n-half Clue