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

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

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

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

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