Discussion
A crater - shaped hole in glass is ________ on the side where the projectile entered the glass :
Answer: B
A crater shaped hole in glass is narrower on the side where the projectile entered the glass, option B. The hole made by a bullet is conical, because the glass chips away from the exit side, so the opening is wider on the side from which the projectile leaves. This allows the direction of fire to be determined from the shape of the hole. The hole is not similar on both sides (A), and the wider side is the exit side (C), not the entry side. The shape of the crater is used to decide the direction of a projectile hitting a window pane: the cone opens in the direction in which the projectile was travelling.
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