1.   All sunscreens work because they contain ingredients which either absorb or reflect UV rays before they harm and damage the skin.

2.   They are not as effective for reflecting heat rays as the less expensive reflective films, but they are as efficient in blocking ultraviolet rays and in reducing glare.

3.   Dozens of people used mirrors to reflect the rays of the winter sun at the papal plane as it descended into the capital city.

4.   During full-moon nights, the silver rays are reflected off white rock formations.