If Keiji stands with his back against a wall in a room with a single light source directly above him on the ceiling, and Smita enters the room, will she see Keiji's front side well-lit or in shadow?

Provide a very brief response.
Smita will see Keiji's front side in shadow. The light source being directly above Keiji means that his body blocks the light from reaching his front side. This creates a shadow on the front side of his body because the light cannot bend around his body to illuminate it from that angle. This means that Keiji's back side is what's exposed to the light and is therefore well-lit, while his front side is obscured from the light source by his own body, resulting in it being in shadow from Smita's perspective.