And mathematically, you can express that in terms of how much that object subtends.

从数学 上讲，您可对象对向程度来表达这一点。

An object is said to subtend a certain angle of your vision based on how close you are to it, and how big it is.

根据您 与它接近程度及它大小，据说一个物体对着您视野某个度。

So if you look at our tiny leaf, it may subtend only two degrees of your vision when it’s at your near point – say, 25 centimeters away.

所果你看着我们小叶子，当它在你近点——比 25 厘米远——时，它可能只对着你两度视线。

The original subtended angle is the subtended angle of the unaided eye – the angle between the center of the objective lens and the height of the real image.

原对是肉眼对——物镜中心与实像高度。

But when you look at the leaf through the lens, the virtual image is larger than the actual object, so it subtends six degrees of your vision.

但是当你通过镜头看树叶时 ，虚像比实际物体大， 所它对着你视线六度。

In order to find the magnifying power of the lens, you just divide the angle subtended by the virtual image by the angle subtended by your unaided eye.

为了求出镜片放大倍率 ，只需虚 像对除肉眼对。

So if you look at our tiny leaf, it may subtend only two degrees of your vision when it's at your near point – say, 25 centimeters away. .

因此，果您看我们小叶子， 当它在您近点（例 25 厘米远）时，它可能只对着您视线两度。

We have the magnification equation, expressed in terms of subtended angles, but we can still use the equations in terms of distance and height for both objects and images.

我们有放大方程， 对表示，但我们仍然可使物体和图像距离和高度方程。

And the newly subtended angle is the amount that the object subtends when viewed through the eyepiece – the angle between your eye and the rays from the eyepiece.

新对向是通过目镜观察物体时对向量——你眼睛与目镜发出光线之间度。

For example, if you’re looking up at the moon, and you cover it with your thumb, then your thumb and the moon are both subtending the same angle to your eye, which we measure in degrees.

例，果您正在抬头看月亮，并拇指遮住它，那么您拇指和月亮都会与您眼睛形成相同度，我们度为单位进行测量。

For example, if you're looking up at the moon, and you cover it with your thumb, then your thumb and the moon are both subtending the same angle to your eye, which we measure in degrees.

例，果你抬头看着月亮，然后拇指遮住它，那么你拇指和月亮都对着你眼睛，我们度数来衡量这个度。