The stained-glass windows at Chartres are especially unique for their emphasis on which of the following colors?

What is defined as the size of the opening in the lens when exposing a photograph to light?

a) aperture b) ISO c) zone system d) resolution

Which artist is known for pointillist paintings that feature optical color mixing?

a)  Georges Seurat b)  Gustave Courbet c)  Paul Gauguin d)  Paul Cézanne