प्रकाश् की गति किसके बीच स� – McqOptions

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1.	प्रकाश् की गति किसके बीच से जाते हुए न्यूनतम होती है ?
A.	काँच
B.	निर्वात
C.	जल
D.	वायु
Answer» B. निर्वात

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