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)
Both (A) and (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

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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
All listed here
Receiver-dependent biases due to clock stability with line

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