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);

Both (A) and (B)
The angle of refraction (θr) is given by sin θ₂ = (n₁/n₂) sin θi
Neither (A) nor (B)
The angle of incidence is equal to 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 but increases the sharpness
Increases both the contrast and sharpness
Reduces the contrast of the image and also its sharpness
Increases the contrast of the image but reduces the sharpness

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