huygens principle and derive it
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Hygiene is a set of practices performed to preserve health. According to the World Health Organization (WHO), "Hygiene refers to conditions and practices that help to maintain health and prevent the spread of diseases."[2]Personal hygiene refers to maintaining the body's cleanliness.
Many people equate hygiene with 'cleanliness,' but hygiene is a broad term. It includes such personal habit choices as how frequently to bathe, wash hands, trim fingernails, and change clothing. It also includes attention to keeping surfaces in the home and workplace, including bathroom facilities, clean and pathogen-free.
Some regular hygiene practices may be considered good habits by a society, while the neglect of hygiene can be considered disgusting, disrespectful, or threatening.
Etymology
Many people equate hygiene with 'cleanliness,' but hygiene is a broad term. It includes such personal habit choices as how frequently to bathe, wash hands, trim fingernails, and change clothing. It also includes attention to keeping surfaces in the home and workplace, including bathroom facilities, clean and pathogen-free.
Some regular hygiene practices may be considered good habits by a society, while the neglect of hygiene can be considered disgusting, disrespectful, or threatening.
Etymology
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The Huygens-Fresnel principle states that every point on a wavefront is a source of wavelets. These wavelets spread out in the forward direction, at the same speed as the source wave. The new wavefront is a line tangent to all of the wavelets.
rosy33:
this answer is more brief and to the point
hiii
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