Elements Of Remote Sensing
Electromagnetic spectrum contains:

Ultraviolet rays (wave length < 10⁻⁶ m)
All of these
Gamma rays (wave length < 10⁻¹⁰ m)
Infrared rays (wave length < 10⁻⁴ m)

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

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