– In Huygens’s eye-piece the distance of the first principal point P1 from the field lens is ….
A. f
B. 3f
C. f/2
D. f/3
Answer:B
– In Huygens’s eye-piece the distance of the first principal point P1 from the field lens is ….
A. f B. 3f C. f/2 D. f/3