zhèzhǒng / fēi niè ěr tòu jìng / zài / tóuyǐngyí / zhōng / néng / yǒuxiào / jiǎnshǎo / túxiàng / jībiàn

这种菲涅耳透镜在投影仪中能有效减少图像畸变。

This type of Fresnel lens can effectively reduce image distortion in projectors.