某小组同学在做“探究凸透镜成像规律”的实验时,他们都将凸透镜

某小组同学在做“探究凸透镜成像规律”的实验时,他们都将凸透镜放置于光具座的A  50厘米刻度处)且保持不变,如图13所示。现有焦距为10厘米或15厘米的凸透镜可选择。

①一位同学将点燃的蜡烛放在凸透镜的一侧,在光具座另一侧68厘米刻度处的光屏上得到一个倒立、缩小的实像,则凸透镜的焦距可能   (5)   厘米。

②另一位同学先后两次将点燃的蜡烛放在图13中距B6厘米处(B点位置为30厘米刻度处),凸透镜的   (6)   (选填“左”或“右”)侧移动光屏,可在光屏上得到大小不同的两个像。比较两次所成的像,当蜡烛置于光具座上  (7)  厘米刻度处时所成的像较小,凸透镜的焦距可能是   (8)   厘米。

答案

(5)10/1510  (6)右   (7)24     810

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