If you re-use it you will smear oils from your fingers on the lens. Additionally, dust from previously used paper can destroy the coating.
lens paper is fragile
A ruler should be used to measure it. Once you have the perimeter, it would probably be most convenient to express it in terms of either inches or centimeters.
i had this problem once. But if its not paper, you can use some microwaved baby oil. it works like a charm!
The paper spiral turns due to the heat rising (thermal) from below. Once the heat is turned off, there is no longer a thermal to turn the spiral, so the spiral ceases to turn.
i don't think so but it could be i know a man who told me a legend on how people once used leaves and supposedly there is now some type of paper but i don't believe that myth i checked every supermarket in town and couldn't find anything called toilet paper... back to leaves i guess
lens paper is fragile
Lens paper should be used only once to prevent the transfer of dirt, oils, and debris from the paper back onto the lens, which can cause scratches or damage. Reusing lens paper can also lead to the buildup of contaminants that might degrade optical clarity. Additionally, single-use lens paper is designed to be soft and lint-free, ensuring that it effectively cleans without leaving residue or fibers behind. Using it only once helps maintain the integrity and longevity of your lenses.
http://wiki.answers.com/Q/Why_should_you_use_a_piece_of_lens_paper_only_once"
Yes converging lens. The power of the lens is given by reciprocal of its focal length. Moreover the power for converging action is +ve. So as we place two converging lenses ie convex lenses, then we have to add the powers. Once again the power becomes +ve. So converging action is definite.
When the paper is placed under a magnifying lens, the lens focuses light onto a small spot, raising the temperature. This concentrated heat causes the paper to reach its ignition point, leading to combustion and burning of the paper.
Open Hood, Remove single screw from top of Blinker or Marker Light. Once Removed slowly pull lens out and you should be able to get to bulbs from there once you turn connectors and remove from Lens Assy
The solution impregnated in lens papers will evaporate, so it is best to use a fresh sheet each time, and keep the remaining sheets well sealed when not in use.
Once you get your school certificate there should be a student number on the paper.
Fresh ginger should be stored in the refrigerator in an airtight container or wrapped in a paper towel to keep it fresh once it is cut.
The scanning lens of a compound microscope is used whenever a new slide is viewed or when the view of the specimen in the field of a higher power lens is lost. Think of it as the "neutral" position for the lens array. The scanning lens has the greatest working distance of the lens group on the microscope and is far enough away from the slide to avoid crunching the slide (and possibly damaging the lens) when attempting to focus. Many microscopes are parfocal, meaning that once you have a focused view of the specimen with the scan lens the image will be in, or very near in, focus when you swivel to a higher power lens. Very important! If you can't find a good view at higher power, or you "lose" the specimen after trying to focus with the fine focus knob only, go back to the scanner lens. Never use the coarse focus with anything but the scanner lens in position. Not doing this is probably the number one reason slides get crunched. And everyone will know because it usually makes an unmistakable sound that reverberates all over the lab.
You should start by using the lowest power objective lens, usually the 4x or 10x objective, to locate and center the specimen on the slide. Once the specimen is in focus, you can switch to higher magnifications for more detailed viewing.
Independent Lens - 1999 For Once in My Life 12-12 was released on: USA: 1 February 2011