Valguse langenurk on nurk, mille moodustavad saabuv valguskiir, laine või osake pinnaga risti oleva sirgega (normaaliga), või nt ka lennuki tiiva fikseeritud kinnitusnurk kere suhtes.
An angle of incidence is the angle made by an incoming light ray, wave, or particle with a perpendicular line (the normal) to a surface, or the fixed mounting angle of an airplane wing relative to the fuselage.
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