Optical fibers used in communication are developed based on
the phenomenon of
(1) refraction of light
(2) diffraction of light
(3) interference of light
(4) total internal reflection of light
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. If a gas is compressed to half of its original volume at 270C, to what temperature should it be heated to make it occupy its original volume? (a) 3270C (b) 6000C (c) 540C (d) 3000C
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