A disk with sectors of pr
A disk with sectors of primary colors which turns white when  spinning. A telescope whose eyepiece is on the side of the tube.  The rings seen on the point of contact between a convex lens and a  plane surface. A law which states that an object's rate of cooling  is proportional to the temperature difference of its surroundings.  FTP, all these things are named after what scientist, who also lent  his name to four laws of motion?
A disk with sectors of primary colors which turns white when  spinning.
Isaac {Newton}