1. A lunar eclipse occurs when the earth comes between the sun and the moon.   True   False   2. _______ is an instrument used to compare the luminous intensities of two sources of light.   Electroscope   Photometer   Camera   Hint Half-n-half Clue   3. The solar eclipse occurs more frequently than the lunar eclipse.   True   False   4. Illuminance of a surface is proportional to the power of the light source and inversely proportional to the square of the _______.   distance   luminous intensity   area   Half-n-half Clue   5. Light always travels in straight lines.   True   False   6. A _______ eclipse occurs when the moon comes between the sun and the earth.   lunar   solar   7. _______ is a type of solar eclipse where the moon's shadow covers the sun's center and has a ring of sunlight around it.   An annular eclipse   A helical eclipse   A lunar eclipse   Half-n-half Clue