विभिन्न माध्यमों में प्रकाश की चाल
ª निर्वात – 3X105
ª पानी – 2.25X108
ª तारपीन का तेल - 2.04X108
ª काँच – 2X108
ª रॉक साल्ट – 1.96X108
ª नाईलेन - 1.96X108
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