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题目材料：
Mark Twain relished the huge cutthroat trout fished from Lake Tahoe but reported them uncommonly difficult to catch. Tahoe's extraordinary clarity may be one reason: Twain thought it an advantage that he could see the trout but did not realize that they could see him Light bends when it enters water, rendering floating objects outside a given circle invisible from underwater. The radius of such a circle, known as Snell' s Window, expands with the relative depth of the viewer's position. The Tahoe cutthroats lived very deep and could have seen Twain's boat long before it came to rest overhead. Moreover, the eyes of trout continue to grow along with their overall body size, and larger eyes, having more cones, provide sharper vision.
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以上解析由 考满分老师提供。
