COMPUTER NETWORKS AND COMMUNICATIONS
WIRELESS COMMUNICATION TECHNOLOGIES
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Surfaces with rough texture such as Foliage, lamp post, street signs, walking pedestrian, etc.
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Large buildings, earth surface and objects with large surface area
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Obstacles with dimensions in order of wavelength
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None of the above
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Detailed explanation-1: -Light reflects from a smooth surface at the same angle as it hits the surface. For a smooth surface, reflected light rays travel in the same direction. This is called specular reflection. For a rough surface, reflected light rays scatter in all directions.
Detailed explanation-2: -The interface of a very rough surface will tend to reflect light at many different angles, because the light meets the surface at many different angles. The reflected light is so diffused that the observer cannot view images of the surroundings.
Detailed explanation-3: -Reflection of light from a rough surface is called irregular reflection of light for e.g. a rock, sand, rough wooden table, etc. From this kind of surface, a ray incident on the surface is scattered at many angles rather than at just one angle.
Detailed explanation-4: -When white light from sun enters the earth’s atmosphere, the light gets scattered i.e., the light spreads in all directions by the dust particles, free water molecules and the molecules of the gases present in the atmosphere. This phenomenon is called scattering of light.