Focus

How ordinary curved lenses focus light A traditional convex lens focuses light because of refraction (bending of light at a curved interface). When parallel rays of light hit a curved lens: The curvature ensures that each part of the lens … Read More

After selecting their buttons, players assemble their dice. Most buttons have five dice, but some have more or fewer, and in certain cases the number of dice may change over the course of the game. The size—that is, number of … Read More