Newton's rings occur when __________. ANSWER Unselected a lens that has slight convex curvature on the top and is flat on the bottom is placed on an optically flat plate of glass and illuminated from above with monochromatic light Unselected a lens that is flat on top and has slight convex curvature on the bottom is placed on an optically flat plate of glass and illuminated from above with monochromatic light Unselected two perfectly flat surfaces are placed on top of each other and illuminated from above with monochromatic light Unselected a lens that is flat on top and has slight convex curvature on the bottom is placed on an optically flat plate of glass and illuminated from above with colorful light