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

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Elements Of Remote Sensing
Which one of the following parameters is accurate for DGPS?

Positional accuracies ~ 1 - 2 m if rover is less than 1-2 km from the reference station
Positional accuracies ~ 5 - 10 m if rover is less than 25 km
Positional accuracies ~ 5 - 10 m if rover is less than 5-10 km from reference station
Positional accuracies ~ 2 - 5 m if rover is less than 2-5 km from the reference station

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Elements Of Remote Sensing
Which one of the following residual biases involves the GPS accuracy?

Signal propagation biases due to the sphere and troposphere propagation
Satellite dependent biases due to uncertainty in the orbital parameters of the satellite
Receiver-dependent biases due to clock stability with line
All listed here

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