focal sphere 中文意思是什麼
focal sphere
解釋
焦球-
The diameter of a sphere is four times the focal length of a concave mirror cut from it
凹面鏡如果是從圓球上切下來的,圓球的直徑會是凹面鏡焦距的四倍。 -
To get a projection focal length of 61 centimeters requires a glass sphere whose diameter is a whopping 2. 4 meters
要得到焦距61公分的投射鏡,玻璃圓球的直徑得大到2 . 4公尺。
分享友人