Unlike fluorescent light, why does sunlight produce sharper shadows?
539515
Moses and Campbelp have it right--the fluorescent light is closer and of larger apparent size (especially if it is a long tube!).  The sun's shadows are not perfectly sharp because it has some size.  This is the cause of the "penumbral" lunar eclipse, when the moon dims but is not fully eclipsed, as it passes through the dim but not dark portion of the Earth's shadow (the penumbra--the darkest part of a shadow is the umbra).
1053233
the hot pavement creates a layer of hot air just above it.. and the cooler air above that make a difference in density barrier.. which reflects light... as long as it is below a specific angle <so you see the reflection from far off but not right at your feet>\n\nI think.. hehe
297899
If you mean how are shadows formed, the answer is simple.  A solid object blocks light.  Since the light can't go through it, then the area all around it has light, but the area right behind it is dark.  \n\nSince light bounces around, it's not completely black inside the shadow.  Some light will still bounce in there and light it up a little, but it won't be as much light as the area around it.  Less light = shadow.
401016
because of the distance and variations of the surface temperature of the sun, plus the infrared spectrum within the sun, sun spots appear darker.Photvoltiac activity is contained within or under the suns surface, thereby hidden from our view, but detected via spectrum analyzers
614148
Clothes have a lot of fibres sticking out from them which give them that fuzzy feeling. These fibres diffract light and thus reduce the intensity of the reflected colour. When its wet, the fibres collapse or are all aligned in one direction, this doesn't diffract light to that extent and the colour is dark.
227084
Your photos are over-exposed. Just like the reason why you shouldn't look at the sun with the naked eye, pointing the sun at any electronic optical equipment won't work properly. You should have used a strong filter to stop the glare.
67858
The sunlight gives cllorphyl a pigment to turn green when thiers less sun the other pigments reflect because the subnlight is not as strong as b4
1080725
shadow is formed through light.
5896
A shadow (not always though).
1095651
Okay, everyone else so far is WRONG. The sun, like any well-behaved (approximate) blackbody, does absorb light which impinges upon it. A good illustration would be if the sun were part of a binary star system and it's companion star were 20x brighter. When you are positioned such that all of both stars were visible to you, things would be quite bright and you'd be wishing for some SPF 10,000. Now, if the sun moved in front if it's brighter companion (from your point of view), the total amount of light you see from the binary system would be reduced by a factor of around 20 because you would be in the SHADOW of the sun with respect to the brighter star... in other words the sun itself, although it is a light source, would be shading you from it's brighter companion because it does absorb light. I hope this helps.
841151
Sunlight fades colors, especially when magnified by shining through glass.  You can treat the display windows to reduce the amount of damaging sunlight coming in, or add an awning.
201834
You are on the right track. It's quite simple:\n\nGenerally, wet things look darker because they refract less light. Light, which is made of photons, refracts against an object and lands on your retina and your brain can register some amount of darkness or brightness. Now when that object is wet (assuming it is hydrophilic or "wettable") more light is absorbed by the water so less light lands in your eyes and the object appears darker.\n\nGreat question!
1020692
Sunlight is known as white light. Whit light is made up of seven different colored lights: Red, orange, yellow, green, blue, indigo and violet. When a ray of white light passes through a prism, it breaks into its components. This happens because all the seven colored lights have different wavelenghts and slightly diferent travelling speeds. A water droplet acts like a prism and refracts/divides white light into its seven componenets resulting in a rainbow.
699380
Lots of cloudy weather = less sunlight = diminished photosythesis
583753
The tubelight has greater surface area compared to bulb and hence seems brighter.  The bulb has a incandescent filament glow which casts darker shadow as compared to fluoroscent glow of tube light.  For this reason it is said that fluorescent lights are really more efficient than normal light bulbs\n\nCheck it out for yourself at :--
372910
When the sun is setting, the position of it results in a mixture of reds, oranges and yellows.  This is because those particular wavelengths are refracted less and therefore seen.  As a result, the other wavelengths (green, blue, indigo, violet) are not seen.  This is also the case in sunrises but sunsets are more brilliant because there are more particles in the air at this time of day (dust, pollution, dirt).  The increase in "substance" in the air results in refraction of ROY to increase.  \nThe dominance of the other three wavelengths (BIV) or (ROY) are seen more as apposed to green.  Remember, when you see color in the sky (either reds, oranges and yellows during sunset/sunrise or blues during midday) this is a mixture ,  so the "in between" wavelength, green, is overridden. \nHowever, there are occasions when you can see green in a sunset for a short period of time.  This is known as "a green flash."  You can read on about this rare phenomenon at: http://hyperphysics.phy-astr.gsu.edu/HBASE/atmos/redsun.html
1036658
When sunlight travels through the atmosphere, blue light scatters more than the other colors, leaving a dominant yellow-orange hue to the transmitted light. The scattered light makes the sky blue; the transmitted light makes the sunset reddish orange. \nI could go into explaining it, but I'm too tired at the moment. Check out here: