※ 引述《plokijuhygtf (牛奶人)》之銘言：
: 懇請大大幫我推導這個式子：AΩ=A'Ω'
: A=source area
: Ω=solid angle subtended at the source by the entrance aperture of the optical
: system
: A'=image area
: Ω'=solid angle subtended at the image by the exit aperture
: 麻煩可以的話請寫詳細一點，感激不盡!Orz....
: 相簿裡有圖，也有一小段敘述，密碼是optical
: http://www.wretch.cc/album/album.php?id=gary0929&book=7
原文有說明..要使上式成立..
1. the optical system is aberration free .
2. the optical system has no internal aperture which limit the beam.
顯而易見
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