Which of the following terms describes the device within a lens which controls the amount of a light passed by the lens?
A. Concentric.
B. Diaphragm.
C. Adjustment.
D. Obstructor.
Answer:B
Which of the following terms describes the device within a lens which controls the amount of a light passed by the lens?
A. Concentric. B. Diaphragm. C. Adjustment. D. Obstructor.