What hapens to light when it goes through a lens? a. it is reflected b. it becomes brighter c. it is refracted d. it speeds up! im so dumb i dont get this ill give brainliest

According to the article, what valid claim came from the national research council? there is no association between fluoride exposure and increased cancer risk in humans. there is a possible link between fluoride exposure and increased cancer risk in humans. there is a definite link between fluoride exposure and increased cancer risk in humans.