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

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

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Elements Of Remote Sensing
The part radiation due to scattered/diffused radiation entering the field of view of a remote sensor other than that from the required target,

Reduces the contrast of the image and also its sharpness
Increases the contrast of the image but reduces the sharpness
Increases both the contrast and sharpness
Reduces the contrast but increases the sharpness

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