In a room with a single small window on one wall, Keiji is standing directly in front of the window with his back to it, while Amara is standing on the opposite side of the room facing the window. The sun is setting directly in line with the window. What does Amara see on the wall behind Keiji, and why? Provide a short response.
Amara sees Keiji's shadow on the wall behind him. Since the sun is setting directly in line with the window, the light from the sun streams through the window and hits Keiji, who is standing in front of it. Keiji's body blocks some of the sunlight, creating a shadow on the wall opposite the window, which is the wall behind him. This is because when an object obstructs the path of light, it creates a shadow in the shape of the object on the surface opposite the light source. The size and clarity of the shadow depend on the distance between Keiji, the light source, and the wall, as well as the angle and intensity of the sunlight. However, the basic reasoning here is that light travels in straight lines, and when these lines are blocked by an opaque object (Keiji, in this case), it results in a shadow on the surfaces beyond that object.