Question: The light bulb in a bathroom ceiling is directly over a toy boat floating in a bathtub filled with water to a depth (x). How

The light bulb in a bathroom ceiling is directly over a toy boat floating in a bathtub filled with water to a depth $x$. How does the shadow the boat casts on the bottom of the tub compare with the shadow it casts when the water is drained out and the boat is held the same distance $x$ above the tub bottom? Treat the bulb as a point source.

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