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?

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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