The refractiver index of windshield glass is ~1.5
Quote:
https://chem.libretexts.org › Ancillary_Materials › Laboratory_Experiments › Wet_Lab_Experiments › Analytical_Chemistry_Labs › ASDL_Labware › Forensic_Science_Laboratory › Glass › Typical_Results_for_Refractive_Index_Determination _of_Glass
Typical Results for Refractive Index Determination of Glass
Table 2. Index of Refraction for Specific Glasses; Glass Index of Refraction; Windshield glass 1: 1.518: Windshield glass 2: 1.520: Headlight glass from Toyota Celica: 1.478: Headlight glass from Chevrolet Eurosport: 1.488
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This means as windshield angles pass 45 degrees, more light is reflected and less passes through. ... when the glass is clean.