Which of the following is NoT a characteristic of electromagnetic light waves? A. They can’t travel through a vacuum. B. They travel at the same speed through any one material. C. They obey the formula: velocity = wavelength x frequency. D. They can be reflected and refracted.

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.