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有些物理习题,由于约束条件的限制,制约了某些物理量的取值范围.这些物理习题,如果我们根据约束条件建立不等式或不等式组,就能删繁就简快捷解决问题.1.物体在凸透镜前30 cm处,通过凸透镜在另一侧12 cm处的光屏上成像,当物体向凸透镜靠近10 cm,所成的像A.一定是实像B.一定是放大的像C.一定是虚像D.一定是缩小的像解析据凸透镜成像规律,物体在凸透镜另一侧的光屏上成的像一定是实像,物距u=30 cm,像距v=12 cm.
Some physical exercises restrict the range of some physical quantities because of the constraints.These physical exercises, if we construct the inequality or inequality group according to the constraints, will be able to solve the problem simply and easily.First, the objects in the front of the convex lens 30 cm Department, through the convex lens on the other side of the screen at 12 cm imaging, when the object to the convex lens near 10 cm, the resulting image A. Must be real image B. Must be magnified like C. Must be a virtual image D. Must be According to the law of imaging of the convex lens, the image of the object on the other side of the convex lens must be a real image, the object distance u = 30 cm, and the image distance v = 12 cm.