如图是某同学在低倍显微镜下观察到的蚕豆叶下表皮的物像,但物像不清晰,这位同学还需要( ) A. 实验课上,同学们用低倍显微镜下观察蚕豆叶下表皮时,甲、乙、丙...
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A、调节粗准焦螺旋和细准焦螺旋都是升降镜筒,调节物体与物镜的距离,以便观察清楚物像,粗准焦螺旋的升降范围大,属于粗略调节,细准焦螺旋的升降范围小,属于精确调节,应该调细准焦螺旋,故A正确; B、由图可知被观察物体已经在视野范围内了,不必再移动被观察物体了,故B不正确; C、现在不是亮度不够,而是略不清晰,所以不必改成提高亮度的凹面镜,故C不正确; D、显微镜没有光圈,故D不正确. 故选A. |
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