A .90°
B .60°
C .45°
D .30°
[单选题]光发生反射时、若入射角为30°,则反射角为( )。A.90°B.60°C.45°D.30°
[单选题]光发生反射时,若入射角为30°,则反射角为( )。A.90°B.60°C.45°D.30°
[单选题]光发生反射时,若入射角为30°,则反射角为()。A.90°B.60°C.45°D.30°
[单选题]光发生反射时,若入射角为30°,则反射角为()。A.90°B.60°C.45°D.30°
[单选题]光发生反射时,若入射角为60°,则反射角为()。A .30°B .60°C .90°D .45°
[单选题]光发生反射时,若入射角为45°,则反射角为()。A . 30°B . 60°C . 45°D . 90°
[单选题]光发生反射时,若入射角为60°,则反射角为( )。A.30°B.60°C.90°D.45°
[单选题]光发生反射时,若入射角为60°,则反射角为()。A.30°B.60°C.90°D.45°
[单选题]光发生反射时,若入射角为45°,则反射角为()。A.30°B.60°C.45°D.90°
[单选题]光发生反射时,若入射角为60°,则反射角为()。A.30°B.60°C.90°D.45°