IV. Write TRUE if the statement is correct and FALSE if not. 16. Light rays travel in a zigzag line. 17. When the light rays cannot pass through an object, there is a formation of shadow. 18. The shadow is shortest when the sun is high on the sky. _ 19. The shadow is longest when the sun is low on the sky. 20. The length and position of shadow will not change as the sun change its position.