Elements Of Remote Sensing
"An Electromagnetic wave falls on to a boundary between two losses less homogeneous media with different refractive indices, a part of the wave is reflected back to the incident medium and the rest is transmitted on to the second media". This phenomenon is known as:

Fresnel reflection
Fresnel refraction
Snell's law
None of these

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

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