Elements Of Remote Sensing
Geodimeter is based on:

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

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Elements Of Remote Sensing
The part radiation due to scattered/diffused radiation entering the field of view of a remote sensor other than that from the required target,

Increases both the contrast and sharpness
Reduces the contrast but increases the sharpness
Reduces the contrast of the image and also its sharpness
Increases the contrast of the image but reduces the sharpness

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