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Which of the following varies with the refractive index in the atmosphere?

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Which of the following varies with the refractive index in the atmosphere?

(a) Radio horizon

(b) Optical horizon

(c) Line of sight (LOS)

(d) Both radio horizon and LOS

The question was asked in an interview.

Query is from Space Wave Propagation topic in portion Space Wave Propagation of Antennas

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Best answer
Right choice is (a) Radio horizon

To explain: LOS is the distance covered by a direct space wave from transmitting to receiving antenna. It depends on the height of the transmitting and receiving antennas and effective earth’s radius factor k. Radio horizon varies with the refractive index in the atmosphere. Optical horizon is less than LOS.

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