Bulletproof glass is a strong and optically transparent material that is particularly resistant to penetration by projectiles. Like any other material, it isn’t completely impenetrable. It is usually made from a combination of two or more types of glass, one hard and one soft.[citation needed] The softer layer makes the glass more elastic, so it can flex instead of shatter. The index of refraction for both of the glasses used in the bulletproof layers must be almost the same to keep the glass transparent and allow a clear, undistorted view through the glass.
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