Elements Of Remote Sensing
Critical angle of electromagnetic radiation takes place if

Angle of incidence is greater than the angle of refraction
Angle of refraction is equal to 90°
Angle of incidence is equal to 90°
Angle of incidence is equal to angle of refraction

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Elements Of Remote Sensing
Earth observations from a satellite platform provide:

Synoptic view of a large area
All of these
Repetitive observations of the same area with intervals of a few minutes to a few weeks
Constant solar zenith angles and similar illumination conditions

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