Elements Of Remote Sensing
The remote sensing techniques applied for the earth's surface features, is generally confined to the following wave lengths:

4.2 to 5.0, 7.0 to 15.0 μm and 1 cm to 30 cm
0.4 to 1.3, 1.5 to 1.8, 2.2 to 2.6 μm
All of these
2.2 to 2.6, 3.0 to 3.6, 4.2 to 5.0 μm

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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);

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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