如图所示为显微镜结构图,请据图回答:(1)取镜时,左手托[______]______,右手握[______]______.(2)

2025-03-16 18:35:15
推荐回答(1个)
回答1:

(1)在使用显微镜前,应一手托n镜座,一手握c镜臂,将显微镜从镜箱中取出.把显微镜轻轻的放在实验台上略偏左的地方,镜臂朝向自己,镜座距离实验台边缘7厘米左右.这样便于用左眼注视目镜观察,右手做记录.
(2)显微镜对光时的步骤如下:①转动粗准焦螺旋,使镜筒上升;②转动转换器,使低倍物镜对准通光孔;③转动遮光器,使遮光器上最大的光圈对准通光孔;④左眼注视目镜(右眼睁开),转动m反光镜,直到看到一个明亮的视野.
(3)在使用显微镜观察时,要先用低倍的物镜找到物像,需要时再换高倍的物镜.寻找物像时,使镜筒缓缓下降,此时眼睛应从显微镜的一侧注视物镜,先用a粗准焦螺旋找到物像,然后通过目镜观察,同时反方向转动a,然后用b细准焦螺旋使物像调清晰.
(4)在显微镜的结构中,能够调节光线强弱的结构是反光镜和遮光器,反光镜有平面镜和凹面镜两面,遮光器上有大小不等的光圈.当视野中光线过强时,则选用平面镜和较小的光圈;若视野中光线过弱时,则选用凹面镜和较大光圈.因此,高低倍镜转换时需转动g转换器;调节光线强弱除m之处的是k遮光器.
(5)收放:实验完毕,把显微镜的外表擦拭干净.转动转换器,使两个物镜伸向两旁,并将镜筒缓缓下降到最低处,把显微镜放回原处.
故答案为:(1)n;镜座;c;镜臂;
(2)低;m;反光镜;白亮;
(3)a;准焦螺旋;显微镜的一侧;a;b;细准焦螺旋;
(4)g;转换器;k;遮光器;
(5)通光孔;最低.

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