一般认为,人眼可辨认的最小视角为A.1'B.5'C.10'D.1"E.5"

作者: rantiku 人气: - 评论: 0
问题 一般认为,人眼可辨认的最小视角为
选项 A.1' B.5' C.10' D.1" E.5"
答案 A
解析 :由于需要分辨两个点必须在视网膜上有两个以上视锥细胞兴奋,而在其间至少要有一个不兴奋的视锥细胞。因为中心凹处的视锥细胞直径约为1~1.5pm,因此三个视锥细胞的距离约为4.5灶m,这约相当于1'视角。

猜你喜欢

发表评论
更多 网友评论0 条评论)
暂无评论
错误啦!

错误信息

  • 消息: [程序异常] : MISCONF Redis is configured to save RDB snapshots, but it's currently unable to persist to disk. Commands that may modify the data set are disabled, because this instance is configured to report errors during writes if RDB snapshotting fails (stop-writes-on-bgsave-error option). Please check the Redis logs for details about the RDB error.
  • 文件: /twcms/kongphp/cache/cache_redis.class.php
  • 位置: 第 85 行
    <?php echo 'KongPHP, Road to Jane.'; ?>