a glass block of lenth 18cm and refractive index 1.5 contain

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a glass block of lenth 18cm and refractive index 1.5 contains a small air bubble
viewed from one side the bubble appears to 8cm from this side,how far in the
block will it appear to be when viewed from the opposite side?

$a glass block of lenth 18cm and refractive index 1.5 contain$

题目翻译：
玻璃块长度18CM和折射率1.5包含一个小的气泡
从一个侧面观察泡沫似乎8cm这一边,在多远
块将它似乎是从反面看的时候?
解析：
这个题目和水中物体的实际深度本质上是一样的.
实际上可以想见根据观察角度的不同,“看起来”的深度应该是不同的.设“看起来”的深度y',实际深度y,光线在水中的入射角为i,那么根据斯涅尔定律你可以推出：
y'=y * Sqrt[1-n^2 *sin^2(i)]/[n *cos(i)],当i比较小时有近似的y'=y/n.
你可以根据这个网站的图示自己来推导,比较容易.

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