ඝන මාධ්යයක සිට විරල මාධ්යයකට ආලෝකය ගමන් කිරීමේදී අවධි කෝණය $c$ සෙවීමේ සූත්රය
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අෂාන් ඉඳුනිල්
@ashan-indunil
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