What would happen to the transmittance if a fingerprint was left on the cuvette in a spectrometer?
965733
A cuvette is a kind of laboratory glassware, usually a small square tube, sealed at one end, made of plastic, glass, or optical grade quartz and designed to hold samples for spectroscopic experiments. The best cuvettes are as clear as possible, without impurities that might affect a spectroscopic reading.\n\nIn optics and spectroscopy, transmittance is the fraction of incident light at a specified wavelength that passes through a sample.\n\nIf there were a fingerprint, the light would be blocked some and transmittance would be less.
971516
When you light a block of glass, part of the light will be absorbed by the glass.\nIn other words, part of the photons will be absorbed by the glass.\nOther photons will be reflected back by the block of glass, and others will pass through it.\nThe lose of energy of your light ray will be seen as a reduction in the number of photons in the ray, in other words, in a reduction in the ray's INTENSITY. Not as a change in the light's frequency.\n\nHowever, the glass will absorb certain light frequencies better than other. (Each matter has its own "absorption graph").\nBecause of that, if your light ray is not a monochromatic one, it is possible that the ratio between the different light frequencies in the ray will change.
904601
A "true" neon light will have clear glass, if you want to get the specific frequencies that Neon plasma produces.\n\nYou friend's light may have neon gas inside, (impossible to tell), but you don't want it if you want to see what neon light looks like.
1098487
1) A fingerprint sensor\n2) A stored sample of an acceptable finger print\n3) Analysis software to staticially match the finger print\n4) A signal of a match sent to the car ignition\n5) Packaging to fit this into the car\n6) Integration into the security components of the car
690522
That should work pretty well, since the CCDs in most cameras are sensitive out to about 950 nm.  This is only the very near infrared.  The above author I think meant to say to put a piece of exposed and developed film in front of the CCD. This will block out most visible light and let most of this near infrared through. You might have to step the frames/sec down if the camera does not automatically adjust its exposure.
1163833
reflected light will dominate the picture so you meter the most effect
279824
Background -- The Spectronic 20 is a spectrophotometer. A spectrophotometer measures the intensity of a light beam before and after it passes through a sample and compares these two intensities. The Spec 20 reports two types of measurements: percent transmittance and absorbance. Percent transmittance is the ratio of the intensity of the light passing through the sample to the intensity of the light shining on the sample multiplied by 100%. Absorbance is the log of the transmittance. The Spec 20 can measure absorbance and transmittance over a range of wavelengths. You must select a wavelength and calibrate the instrument at that wavelength before making any measurements.
674033
the chassis wont distort the reading. you need to be encompassed in a diamagnetic material for distortion.
1091417
Fascinating question! The surface of the vibrating object would alternately cause reflected light to red shift and blue shift, but that's about as far as my thinking can go. Would the shifts cancel each other, rendering the object invisible?
791236
1)Yes, if u change the property of that medium, by adding glycerine in water, or... etc. then the angle of refration would reverse out...  or depending what u want to attain...\n\n2)The velocity increases, due to the fact that the WAVELENGTH increases.\n\n3) There will be total reflection, no refraction above the glass will be seen\n\n4) to get better shine / reflection in stone -  \ntry to measure reflection off marine or other food (spoilage) -\nEPA can do the same with GAs refration,  eyc\n\n5)Fiber Optics communication,, Electro-Optic modulators,, Wave Scattering phenomenon/research   etc
86731
The splitting and shift of a spectral line into several components in the presence of an electric field.
416072
It depends on the wavelength of the light and its energy.
423752
When light travels through the glass prism, the electromagnetic wave(light) interacts with the atoms and atoms begin to act like tiny transmitters. the light radiated by atoms in the glass "interferes" with the "actual" light from the source\nto produce a "new wave" with its crests at the place where it should have been earlier(in your case where it should have been in future) if the glass had not been there.\nSo we say that the "phase velocity" of light has been increased(or reduced) inside glass by factor and that factor is (1/refractive index) . (i.e.) only the phase changes.if the phase of a wavefront was 5 radian then inside the material it would change to ,say,7 radian.\n        Thus "phase velocity" can be greater than c but the "group velocity" which can transmit information cannot exceed c. (i.e) if I shine light at an electron at a fixed distance and find the time taken by light to reach it and hence disturb it will be found equal to the time taken in the same experiment with the space between me and the electron filled with the medium.
933542
No.  But it's wavelength decreases.\n\n\nDoug
100061
Notwithstanding quantum mechanical effects from quantum field theory involved in photons escaping confined regions that I'm not qualified to answer in regards to, and supposing that you had *ideal* mirrors that reflected all of the incident energy of the photon and if you could seal the box (or probably a better aparatus would be a sphere) before your incident light beam escaped, then I believe the answer is yes.\n\nI'm fairly sure that this is not quite as theoretical as I've made it sound by invoking ideal mirrors and actually is practical.  I'm fairly sure that there is a research group here at my University working on storing information encoded in photons by basically trapping it between two mirrors to bounce back and forth until released for further processing.  I haven't been able to find a link to any research publications on that, but I'll update you if I locate one.\n\nI hope that helps.
311080
Your question is not clear.\n\nThe parameters will depend on what exactly you wish to inspect except that it should be possible to visually inspect it i.e. should be visible & visually distingushable.
1185670
Yes, these devices can be bypassed, if the attacker has a copy of your fingerprint. The professional devices of this kind do much more than checking the image of the fingereprint - e.g., they measure transparency of the capilars and finger temperature, to ensure that they are presented with a real, live finger.\n\nBut the mass-market fingerprint reading devices like the ones you find on laptops, PDAs and FLASH drives don't do this kind of stuff. There have been reports that some of them can be bypassed even with a gummi bear with your fingerprint on it.