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);

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

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

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

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

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

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