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DIN 52305:1995
Determining the optical distortion and refractive power of safety glazing material for road vehicles
The document decribes two projection methods of test for determining optical properties of plane and curved safety glasses for road vehicles, especially windscreens, i.e. a) the diagonal method for the semi-quantitatively measuring of the optical deviation, and b) the zebra crossing method for determining the refractive power.
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Deutsches Institut für Normung [din]
Deutsches Institut für Normung [din]