温度再高的阳光透过平面玻璃也只是一片均匀的光线,不会引起物体的变化。阳光若透过凸透镜,却可以形成白亮的焦点,能把纸或木点燃。炭精棒发出的弧光放在凹面镜的焦点上,可形成巨大的光柱,成为探照灯。激光器发出的光束会使金属顿时汽化。这些光学现象启示我们,要成就一番事业 The high temperature of the sunlight through the flat glass is only a uniform light, and will not cause changes in the object. If the sun shines through the convex lens, it can form a white, bright focus and can light paper or wood. The arc emitted by the carbon rod is placed on the focal point of the concave mirror to form a huge beam of light and become a searchlight. The beam emitted by the laser will vaporize the metal. These optical phenomena inspire us to achieve a career