Elements Of Remote Sensing
A perfectly black body:

Is a diffuse emitter
All listed here
Absorbs all the radiations of every wave lengths
Emits power of every wave length

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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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