【摘要】 焦深是指在保持影像较为清晰的前提下,焦平面沿着镜头光轴所允许移动的距离范围.在薄透镜的焦距测量实验中,必须严格测定物距和像距才能得到精确的焦距.本文对焦深随焦距的变化趋势从理论上进行了研究并且得到了实验的验证,然后利用这种变化趋势有针对性地调节透镜或者像屏来精确测量像距,以此提高焦距的测量精度.更多还原

【Abstract】 Depth of focus is in maintaining a more clear image under the premise of the lensfocal plane along the optical axis are allowed to move a distance.In the thin lens focal length measurement experiments,must be strictly measured object distance and image distance to get accurate focus.This focus depth of the change of focal length has been studied theoretically and verified by experimental results,and then use this trend in a targeted manner to adjust the lens or screen,as accurate measurement of image distance,focal length in order to improve the measurement accuracy.更多还原