Discussion
Radial fractures on glass, surface starts on :
Answer: B
Radial fractures on glass start on the surface opposite the side of impact. When a pane is struck, it bends, and the face away from the blow is stretched and fails first, so the radial cracks begin there and run outward, while the concentric cracks begin on the side of impact. So B is correct, and the edge and the corners of the glass are not where the radial fractures start. The cracks seen in broken glass are of two kinds, radial and concentric. The radial cracks run outward from the point of impact like the spokes of a wheel and begin on the side opposite the blow, where the glass is stretched, and the concentric cracks form a ring around the point and begin on the side that was struck. The examiner uses this to say from which side the glass was broken.
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