positive lens

基本解释

A long working-distance objective was designed which consists of a larger positive power lens and a smaller negative power lens.
物镜为长工作距物镜，由光焦度较大的正光组和光焦度较小的负光组组成。
The third lens group (G3) comprises at least a negative meniscus lens (L33) and a positive lens (L32) sequentially from a side closest to images.
第3透镜组（G3），从最靠像侧起依次至少具有负的弯月形的透镜（L33）、和正透镜（L32）。
ip.com
Results showed that there were significant differences between the two methods in terms of positive spherical lens value, negative spherical lens value and column lens value (P0.01).
结果显示：两种方法测得负球镜值、正球镜值、柱镜值均有显著性差异（P0 .0 1）。

An alternative approach is to appeal to the classical Greek philosophy that views kindness through the lens of reason, emphasizing the positive effects acts of kindness have not just on the receiver of kindness but to the giver of kindness as well, not for the salvation of the soul in the afterlife, but in this life.
FORBES: How to Turn Every Corporate Member into a Philanthropist
While retaining the same smooth AF motor (SAM) as its predecessor, newly-designed rear lens elements suppresses flare and ghost, while mechanical elements have been upgraded for more positive, comfortable operation.
ENGADGET: Sony NEX-3N and Alpha A58 unveiled, heading to Europe this spring