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Date Posted: 07:58:07 12/29/02 Sun
Author: AVON
Author Host/IP: tp-cs11.hinet.net / 211.22.33.11
Subject: Re: CD
In reply to: 仇耀初老師 's message, "Re: CD" on 07:45:21 05/26/00 Fri

>>
>我想知鐳射唱碟是否可以永久保存?因我聽說碟中的物料會隨?
>> 擗謔荇韙ヾC如果不能,那在物理上最多又可以保存多久呢?
>>
>>
>另外,我找到一些cd是不是圓形的,那樣是怎樣讀取cd的資料?
>>
>Hcd讀取資料不是用一些光射向cd表面,然後反射回來讀取嗎?
>> (如果有錯請指正)
>
>CD 原理並不是折射而是衍射柵(diffraction grating)
>你可以在家中做一個小實驗:
>  將一束激光射向cd表面.
>  用一張紙來呈現反射出來的光. 
>  衍射柵(diffraction grating)圖案就會呈現在紙上
>
>  


在家怎麼做實驗呢?
生活中的激光是什麼?
那CD是否應該為透明才能作到?

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