In a room with a single light bulb hanging from the ceiling, Jia is standing directly under the light bulb, and Sunil is standing in the corner of the room. If Jia is holding a large, flat board above her head parallel to the floor, does the board affect what Sunil can see? Provide a brief response.
The board will block some of the light from the bulb, casting a shadow in the area below it. Since Jia is standing directly under the light bulb, the board will primarily cast a shadow around her immediate area. However, Sunil is standing in the corner of the room, away from the bulb and Jia. The board will not affect Sunil's line of sight to things outside of the shadowed area, such as the walls or objects not under the board. But if Sunil is trying to look at something on the ceiling or an object floating in the air that is within the shadowed area created by the board, his view of that particular thing might be obstructed by the shadow. For things in direct line of sight, not obscured by the shadow (including the light bulb itself if he's far enough from Jia), Sunil's view would not be affected by the board Jia is holding.