At which point does the pendulum have the highest velocity

The pendulum has the greatest speed as it passes through the lowest position, straight down, where it was hanging limply before you started it swinging.

convex lenses are thicker at the middle. rays of light that pass through the lens are brought closer together (they converge). a convex lens is a converging lens. when parallel rays of light pass through a convex lens the refracted rays converge at one point called the principal focus.

6 cos 34, 6 sin 34 trig