什么是:<b>(a)</b>正常人眼的远点?<b>(b)</b>正常人眼的近点?
<a href="https://tutorialspoint.com/articles/category/academic" target="_blank"><span>学术</span></a><a href="https://tutorialspoint.com/articles/category/physics" target="_blank"><span>物理学</span></a><a href="https://tutorialspoint.com/articles/category/ncert" target="_blank"><span>NCERT</span></a><a href="https://tutorialspoint.com/articles/category/class-10" target="_blank"><span>10年级</span></a>
<b>(a)</b>正常人眼的远点位于<b>无限远</b>。
<b>(b)</b>正常人眼的近点位于眼睛前方约<b>25厘米</b>。
解释
<b>远点</b>是指眼睛可以清晰看到物体的最远点。正常人眼的远点在<span style="font-weight: 700;">无限远</span>。
<span style="font-weight: 700;">近点</span>,也称为<span style="font-weight: 700;">明视距离</span>,是指正常眼睛在不费力的情况下可以清晰看到物体的最小距离(或最近点)。正常人眼的近点或明视距离约为<span style="font-weight: 700;">25厘米</span>。
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