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G
o
o
g
l
e
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Forvo
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+
Brechungszahl
eines Mediums für eine monochromatische Strahlung der Wellenlänge im Vakuum
f
light.
مؤشر الانكسـار
لوسط لوسط إشعاع أحادى الطور الموجى لموجة طولها λ فى الفراغ
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