A. to produce parallel beams of light
B. to filter the light rays
C. to make them
D. no function
A. Multimode index fiber
B. Graded index fiber
C. Single mode step index fiber
D. Copper wire
A. fo+fe
B. fo/fe
C. fe/fo
D. (1+fo/fe)L/fo
A. Diodes
B. Repeaters
C. Laser
D. Transformer
A. 42°
B. 47°
C. 52°
D. 50°
A. center of curvature
B. focus
C. optical center
D. aperture
A. 10 dioptre
B. 10 dioptre
C. 1 / 10 dioptre
D. 1 / 10 dioptre
A. 2 f
B. 2.5 f
C. 3f
D. 4f
A. between principal focus and center of curvature
B. beyond 2 f
C. at the principal focus
D. between principal focus and optical center
A. 0.5
B. 0.2
C. 1
D. 2