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2008年北京奥运会圣火传递最神圣的要算圣火登峰了．5月8日凌晨1点30分至3点30分，19名火炬手分批从珠峰北坡海拔8300米的突击营地出发，向顶峰冲刺．在距顶峰30米处，罗布从火种灯中引燃了取火棒，再用取火棒点燃了第一棒火炬手吉吉手中的火炬．随后经过、尼玛次仁、的传递后，第五棒、也是最后一棒火炬手次仁旺姆于9点17分在8844.43米的珠峰顶峰展示了熊熊燃烧的“祥云”火炬． 经过6个小时的艰苦跋涉，北京奥运会“祥云”火炬于上午9点多，抵达世界最高峰珠穆朗玛峰顶峰，并进行传递．北京奥运圣火珠峰传递获得圆满成功．根据以上资料回答下列问题： （1）采集奥林匹克圣火的唯一方式是让阳光集中在一枚凹面镜的中央，让它产生高温，然后引燃圣火．你知道这是运用到了哪些光学知识？此原理在我们的日常生活中还有哪些运用？试举一例． （2）火炬手和相关人员凌晨三点就从8300米的大本营出发，短短的五百多米他们花了六个多小时攀爬…，请你计算一下火炬手们在这段路程中行进的平均速度是多少？若正常人步行速度以1米/秒计算，正常人步行速度为圣火传递队员行进速度的多少倍？
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