[問題] 光速
請問一下
我們在相對論中學到光速不變,
可是電磁學裡光速=1/(a*b)^(1/2),a=permeability, b=permittivity
這樣的話在不同的介質裡a或b改變
光速不就改變了嗎?
那所謂的光速不變是有條件的囉?
感謝解惑,麻煩了。
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