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

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

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Elements Of Remote Sensing
Pick up the correct definition from the following with response to GIS.

Common boundary between two areas of a locality is known as adjacency
The area features which are wholly contained within another area feature, is known so containment
All of these
The geometric property which describes the linkage between line features is defined as connectivity

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