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    October 10

    钻石为什么这样亮

    钻石的折射率高达2.417,所以全反射角为
     
    arc sin(1/2.417) = 24.4 degrees
     
    有这样小的全反射角,射入钻石的光线很容易在perfect cut的钻石底部完成两次全反射,外面看起来就会闪闪发亮。

    Comments (9)

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    Mindywrote:
    gxgx!!
    Nov. 6
    Xinlewrote:
    说到钻石,最近刚看到一个网站http://www.lifegem.com/,就是可以拿先去世的那个人身上的碳来做钻石,戴在手上。
    Nov. 1
    Zhaojingwrote:
    for generations diamonds have been a symbol of luxury, valued not only for their appearance byt also for their rarity. but geologists will tell you that diamonds aren't all that rare. in fact, according to the down jones-irwin guide to fine gems and jewelry, diamonds are "more common than any other gem-quality colored stone. they only seem rare..."...mainly diamonds seem rare because de beers makes them rare: the company controls most of the world's diamond mines and limits the quantity of diamonds supplied to the market. (krugman and wells, 2005) 
    Oct. 29
    Picture of Anonymous
    Mervin wrote:
    恭喜恭喜!
    Oct. 22
    Sherry Wangwrote:
    gxgx, 买多少克拉的啊?LOL
    Oct. 18
    weiyang maowrote:
    Congratulations & Bless
    Oct. 11
    Seanwrote:
    congratulations!
     
    看准好股票,就要及时出手,然后长期持有。
                                                       ——巴菲特的价值投资啊
    Oct. 10
    ping xiewrote:
    你Y就engage了?真快真快!!!!
     
    Bless一下
    Oct. 10
    Fanfanwrote:
    bless:)
    Oct. 10

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