11. The core of a fiber optic is surrounded by :
(a) wire braid shield
(b) kevlar
(c) cladding
(d) plastic insulation
12. Refraction is the :
(a) bending of light waves
(b) reflection of light waves
(c) distortion of light waves
(d) diffusion of light waves
13. When a beam of light enters one medium from another, which quantity will not change ?
(a) direction
(b) speed
(c) frequency
(d) wavelength
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