Elements Of Remote Sensing
Which one of the following statement is correct?

All of these
Radiant energy expressed in Joules, is the energy associated with electromagnetic radiation
The rate of transfer of radiant energy is called flux and is expressed in watts
The radiant energy which falls upon a surface is termed as irradiance

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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)
Both (A) and (B)
The angle of refraction (θr) is given by sin θ₂ = (n₁/n₂) sin θi

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