6. The operation of the fiber-optic cable is based on the principle of :
(a) refraction
(b) reflection
(c) dispersion
(d) absorption
7. The core of a fiber optic cable is made of :
(a) air
(b) glass
(c) diamond
(d) quartz
8. The inner portion of the fiber cable is called :
(a) cladding
(b) coating
(c) inner conductor
(d) core
9. Which of the following is not a common type of fiber-optic cable ?
(a) single-mode step-index
(b) multimode graded-index
(c) single-mode graded-index
(d) multimode step-index
10. The ratio of speed of light in air to the speed of light in another substance is called the :
(a) speed factor
(b) index of reflection
(c) index of refraction
(d) dielectric constant
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