– In Ramsdens’s eye-piece, the two principal planes are ….
A. Parallel to each other
B. Perpendicular to each other
C. Crossed to each other
D. None of these
Answer:C
– In Ramsdens’s eye-piece, the two principal planes are ….
A. Parallel to each other B. Perpendicular to each other C. Crossed to each other D. None of these