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
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