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

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

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Elements Of Remote Sensing
Which one of the following statements is correct regarding the GPS satellites?

The nominal altitude is about 20,200 km
All of these
The inclination of axis satellite is 55°
The satellite transmits two L band signals (L1 with 1575.42 MHz and L2 with 1276.6 MHz)

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