Why are areas of black and white film that have been exposed to the most light the darkest part of the film?
554404
That's the way film works.   Esesentially, the emulsion on the film that receives the most light reacts the most and turns darker.  That's why you have to print the negative onto paper, which essentially  reverses the process, putting the dark back to light and vice versa.
1111107
You can count fringes when illuminating the film with a monochromatic light source. This will give you relative thicknesses across the film.  You can make an assumption that at the top where there are NO fringes and the dark part keeps stretching that the thickness is less than half the wavelength of light you are using and at the first bright fringe it is about the wavelength over 2 thick.  \n\nIf you use a sodium lamp for your light source, take care to use a low pressure sodium lamp.  High pressure lamps are nothing near monochromatic
986686
It is how opaque a material is.\n\nIt is measured by how much light can be seen through the material.
401926
Because everything looks better in black and white.\n\nActually, Spielberg said in an interview that he made it in B&W to make it more powerful during and especially at the end when the one bit of color comes on the screen.  I know that I cried like a little girl at the end.
1127386
I can think of 2 possibilities.  One is when they use an occulting disk to block out the Sun (because it is so bright), so you see a black disk, and then you can see the space around the Sun.  They do that to look at the atmosphere around the Sun.  Take a look at the first link below.\n\nThe other possible answer is that the photographs are not taken in normal visible light but some other wavelength.  in the second link, there is a picture where the Sun's 'normal' surface looks dark.  The caption helps explain it.
312834
A shadow is a patch which has a lower intensity of light as compared to its surroundings.\nSo when light cannot go through an opaque object there has to be a lower/nill intensity of light behind the object, thus a shadow is formed.\nAnd as far as the light hitting the opaque object is concerned, it is reflected and/or absorbed to be converted to heat energy.
175012
Think about it this way.  Have you ever looked at a piece of charcoal lit by sunlight in the middle of the night?  Of course this is impossible, but if you could do it you'd be surprised just how bright it would appear.  In daylight, the charcoal is surrounded by other objects which are better reflectors (higher albedos), making the charcoal appear dark by comparison.
814724
I know what you mean, you don't want to know why it is changed into the full spectrum due to that the different colours retract better than others but why it does, well i think it is done at random!
1077475
I like what people are saying about our perception of something being "colored" is based purely on the light reflected and absorbed by the object.  Something black absorbs all light (thus is colorless) which is why black clothing in the summer is a bad idea.  White colored things reflect all light which is why wearing white in summer is a good idea.  If there is NO light present than everything will be black.  If there is light present but at a frequency other than white (say red) everything will either be black and some will be red.  Does that mean that the world is composed of black and red things?  Of course not.  A great example of this is seen when one SCUBA dives.  In the water as you go deeper the colors of the spectrum begin to fade out as they cannot penetrate the water.  (I seem to remember that it starts at the red side, but I may be mistaken.)  Anyway, at 130 feet, say, if you were to look around everything would seem extremely dull, dark and colorless.  Does that mean that the fish and structure at 130 feet have no color?  NO!  Simply take a flashlight down and turn it on to reveal the vibrant colors of the deep.  It's not that there is no color, it's that the (sun)LIGHT can't reach it.
666968
If it reflects all the light, it appears white. If it absorbs all the light, it appears black.
614312
Its all to do with the reflection orf light on concave and convex mirrored surfaces.\n\nSee this web page app. half way down for a more detailed explanation.\n\nhttp://www.mic-d.com/curriculum/lightandcolor/reflection.html
12898
When white light (for example sun light) strikes a black object, almost all the light (all visible wavelengths) are absorbe and not re-released.  That is why a black object heats up more under the sun than a white object that reflects all visible wavelengths.  You can still see the black object because it may not be perfectly black and not all visible wavelengths are absorbed or because some of the white light is reflected at the surface without being absorbed.  For light to be absorbed, the photons must penetrate the material and interact with the electrons of the atoms and molecules it meets which absorbs either none, some or all of the photons before reflecting the rest back to your eye as black, a specific color or white light.  Also consider clear glass where the photons interact with electrons and are almost all allowed to pass through only slowing down because of the longer path - permitting lenses and magnification.
799871
It looks black.  When something absorbs all wavelengths of light t appears black.
265626
white all light, colors are the rays absorbed when all othes don't, black is the absence of color, NO THERE IS NO COLOR.\nI took a painting class where the professor took awy the use of black because of that color theory, we had to make dark shades, given that we were painting something someone could see.
1113966
You are correct.  The dominant effect with a black shirt in sunlight is absorption of energy.  At night, there is minimal incoming energy, so the dominant effect is radiation of energy.  A dark object under an open sky (without clouds to reflect infrared energy back) can get considerably cooler than the surrounding air.
65283
I have a theory.  Paper is semi transparent to start with.  That is why you can 'trace'.  Now, paper is made of small fibers.  The fibres are aligned randomly.  Each fibre is reflecting light in a different direction and you see white if no dye has been added.  Well, put oil on top of the paper and the light will not reflect back at you as much.  Without this interference (reflection) you can see through the paper more easily.\n\nAs an analogy .. if you look west across a lake an hour before sunset, you can't see the other side as well because of the glare.  The other side is other wise easy to see.  Cut down the glare and you can see the other side more easily.
236290
The intensity of the light burns your retina.