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Maybe you are referring to crepuscular rays? http://en.wikipedia.org/wiki/Crepuscular_rays
Nñ
It's simple really. Clouds block the sun just like anything else does: by not allowing the sun's light to pass through. Clouds actually reflect much of the sun's rays back out into space. However, this does not mean that all rays are reflected. This is why we can still see during the day on a cloudy day. Like a piece of white paper or thin curtain, there are still small holes or pores that light waves can travel through. Being that clouds are mainly water particles, light can still pass through, but most of it is refracted or reflected.
Focus or the focal point.
U-V rays; Ultra Violet Rays
Crepuscular rays
Maybe you are referring to crepuscular rays? http://en.wikipedia.org/wiki/Crepuscular_rays
The alert sun stretched its rays through the clouds, eager to awaken the sleeping earth.
Anode Rays are called the canal rays as the cathode used is perforated and the anode rays pass through the holes or canals of The cathode opposite to the anode.
thermal radiation - infa red rays
Clouds bounce UV rays back to space
Clouds do not protect. The ozone layer protects us.
No they are not because they are rays of light
Nñ
Clouds affect living things by their cosmic rays. These cosmic rays have an influence on the overall temperature. Humans are affected by the temperature and weather.
It's simple really. Clouds block the sun just like anything else does: by not allowing the sun's light to pass through. Clouds actually reflect much of the sun's rays back out into space. However, this does not mean that all rays are reflected. This is why we can still see during the day on a cloudy day. Like a piece of white paper or thin curtain, there are still small holes or pores that light waves can travel through. Being that clouds are mainly water particles, light can still pass through, but most of it is refracted or reflected.
Yes! You can get a tan and even a severe sunburn on cloudy days. Thicker clouds and rain are going to prevent a tan or burn, but light overcast skies can lead to nasty burns because you aren't expecting it.