Question: 8) When does refraction happen? Explain it shortly. 9) Consider an antenna with the height of 100 meters. a. What is the optical line of

$8) When does refraction happen? Explain it shortly. 9) Consider an$

8) When does refraction happen? Explain it shortly. 9) Consider an antenna with the height of 100 meters. a. What is the optical line of sight distance? b. What is the radio line of sight distance

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