Fill in the blanks with the correct word from the box below to complete
the concept in the paragraph. Write your answers on a separate sheet of paper.
One of the different electromagnetic radiations that is emitted by the sun and the
only one that can be perceived by the unaided eye is (1)__________ . It travels in (2)
____________ lines. Sometimes it bounces back into the direction of the source. We call
this (3) _________ . Another property of light is to (4) __________. It refers
to the