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接下来,几大主角要登场了。当光和透镜相遇时,光的行动路线会发生怎样的变化呢?光遇到凸透镜外福来拿来一个凸透镜,对着太阳调整距离,地面上的白纸上出现了一个又小又亮的光斑。“哈哈,我把光线聚集起来啦!”没错儿,凸透镜可以会聚光线。新名词光心:透镜的中心,用字母“O”表示。主光轴:通过光心和焦点的直线叫作主光轴,也称主轴。焦点:平行于主轴的光线,通过凸透镜后会聚于主轴上的一个点,这个点叫作凸透镜的焦点,用“F”表示。凸透镜两侧各有一个焦点。焦距:焦点到凸透镜光心的距离叫作焦距,用
Next, several main characters to debut. When the light and the lens meet, the light of the course of action what happens? Light encountered convex lens Fulai to bring a convex lens, adjust the distance against the sun, the ground on the white paper appeared a small bright spot . “Haha, I gather the light up!” True, the convex lens will gather light. The new term optical center: the center of the lens, with the letter “O ” said. Main optical axis: The line passing through the optical center and the focal point is called the main optical axis, also called the main axis. Focus: parallel to the main axis of light through the convex lens converging on the spindle of a point, this point is called the focus of the convex lens, with “F ” said. Convex lens on each side of a focus. Focal length: the distance from the focal point to the center of the convex lens is called the focal length