Elements Of Remote Sensing
Electromagnetic spectrum contains:

Ultraviolet rays (wave length < 10⁻⁶ m)
Infrared rays (wave length < 10⁻⁴ m)
All of these
Gamma rays (wave length < 10⁻¹⁰ m)

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Elements Of Remote Sensing
Geodimeter is based on:

The visible light as carrier with frequency of the order of 5 × 1014 Hz
Propagation of modulated light waves
Propagation of infrared radiation
High frequency radio waves

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