– Huygens’s eye-piece consists of two Plano-convex lenses, a field lens, and an eye lens. The focal length of the field lens is ….
A. F
B. 2f
C. 3f
D. 4f
Answer:C
– Huygens’s eye-piece consists of two Plano-convex lenses, a field lens, and an eye lens. The focal length of the field lens is ….
A. F B. 2f C. 3f D. 4f