I have one lens hood for a 28-105mm lens that is petal shaped. I have another lens hood for a 50mm lens that is fully round. If the purpose of the lens hood is to block stray light, then wouldn't fully round always block more?
Answer
As Chills stated, petal shaped hoods are designed to better take into account the wider shape of a camera's film or sensor.
This article on Lens Flare has a good description of lens hoods and how they function.
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