Elements Of Remote Sensing
Coherence of two electromagnetic waves takes place if their phase difference is:

Constant in space
Constant in time
None of these
Constant in time and space

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Elements Of Remote Sensing
According to the Snell's law if an electromagnetic wave is incident in a medium (refractive index n₁) on another medium (refractive index m₂);

Neither (A) nor (B)
The angle of refraction (θr) is given by sin θ₂ = (n₁/n₂) sin θi
The angle of incidence is equal to the angle of refraction
Both (A) and (B)

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Elements Of Remote Sensing
Geodimeter is based on:

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

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