A) at what two points between object and screen may a converging lens with a 3.00 cm focal lenght be placed to obtain an image on the screen?
B) what is the magnification of the image for each position of the lens?
The imaging equation is
1/do + 1/d1 = 1/f
f = 3.00 cm
d0 + di = 18.0 cm
Substitute for do:
1/(18.0 - di) + 1/di = 1/3.00
di + (18.0 - di) = di*(18.0 - di)/3
54 = 18.0*di - di²
di² - 18.0*di + 54 = 0
di = 3.8, 14.2
di = image distance, or the distance from lens to the screen.
So the lens may be placed 3.8 cm from the screen, or 14.2 cm from the screen.
If the lens in 3.8 cm from the screen, the magnification is di/do = 3.8/14.2 = 0.27
If the lens is 14.2 cm from the screen, the magnification is di/do 14.2/3.8 = 3.74
If you ski in Spy Optics Trevor goggles, a Spy Optics Trevor replacement lens is a wise investment. When the unexpected happens on the mountaina hard face plant or a deep scratch from a tree branchhaving a Spy Optics Trevor replacement lens in your bag of tricks insures your vision for the long term.
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Optics-what type of lens set up do I need to view an object which is close up, whilst my eyes are at infinity?
The application is an in-helmet screen for displaying information to a motorcylcist. I want my eyes focussed at infinity since this would prove much safer than having to adjust my gaze every few seconds. A HUD is too complicated and expensive - a suitable lens to view a hacked mobile phone screen (say) would work really well. Any ideas?
A lens with a positive diopter, i.e. a convex lens. It sounds like you are sort of reinventing the bifocal with a different position for the reading lens.
Medium Beam What is the best way to scatter a coherent beam of light?
Assume that your beam is a low-power blue laser.
I understand that a turbid medium such as water would work; however, I'm looking for something more along the lines of say a beam or a wave(possibly microwave radiation...?). Preferably low power(think 10-20 volts) and easy to control. (Would an electromagnetic field work...?) Feel free to be creative.
My first reaction would be to use frosted glass or some other translucent but not transparent medium. As far as using microwave radiation (or any other radiation), that will not help you. Light (electromagnetic radiation) passing through vacuum and, to a large extent, air follows linear equations. I do not mean that it goes in straight lines. I am using the mathematical definition of a linear equation, namely that things add like you think they should add. A direct result of this is that light passing through electrical or magnetic or electromagnetic fields (light, microwaves, etc) will simply pass straight through with no effect from the field. So what you are suggested is mathematically prohibited by the equations that govern electromagnetic fields. Actually, that is not 100% true because you could use a nonlinear medium, like specially designed crystals that allow for the two separate electromagnetic fields to interact... but even if you did that, you would not get scattering, you would get a coherent process that is not scattering. That is my technical way of saying that your idea will not work. The best way to scatter light is to pass it through a scatterer. And things that are translucent are translucent because they scatter light.
By the way, voltage is not always related to power. You can have very high voltage things that involve almost no power (like when you get shocked by static electricity) and very high power things that involve low voltage (like putting 10 or 20V across a metal wire would induce a large amount of power). The better thing to quote when talking about power is the power itself (in units of Watts).
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7 year old handstand BHS series on medium beam
am i good at gymnastics for only 9 days?
well i have been going to gymnastics 1 time a week for nine weeks and i learned how to do back wlkover/back kik over. front tuck on tram and floor with spring board. front hand spring floor and tramp. backhand spring on tramp. cartwheel on high beam. said hand stand on low beam front hand stand on medium beam front hip circle on bars. almost have my kip. tuck on. and front hip circle thing with a spot. is that good for only 9 days?
yeah, that's pretty impressive. you need to keep working hard, though.
Lens Laser what kind of lens is better to converge the light of the laser?
hi everyone:
i want converge the laser light beam, in this case i need a proper lens.
lense type:
bi-convex lens
plano-convex lens
what do you think, which one is better?
concavo-convex lens
Most likely, the concave/convex/planar nature of your lens is irrelevant. To first order, two things go into how tight a focus you can get with a laser: the focal length and the size of the incoming beam. You want a short focal length and a large diameter incoming beam to get a tight focus. You can get a short focal length with any of those lens shapes (in at least one orientation). For example, a 5-cm plano-convex lens is going to be better than any 10-cm lens. And, obviously, the incoming beam has nothing to do with the lens.
Once you get to really short focal-length lenses or really big incoming beams, you start to have to worry about aberrations, and then lens shape (and even lens orientation) becomes more important. But unless you are designing precision optics, you probably are not going to be in that regime.
Highlights: PS Two Laser Lens Type: PVR-802WSupport 77000 Specification: Color: SilverDimensions (cm): 9.8 x 7.8 x 1.2Weight (Kg): 0.0833 Package Contents: 1 x Laser Lens with Handle for PS2 77000
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Use this laser lens cleaner to remove dust and dirt from your DVD player or computer DVD drive's laser lens. The 10-brush cyclone clean process cleans the laser lens and helps to create better DVD playback.
Use this laser lens cleaner to remove dust and dirt from the laser lens in your DVD player or computer DVD drive. The 10-brush cyclone clean process cleans the laser lens and optimizes DVD playback.
2-in-1 VCD/DVD Laser Lens Cleaning Disc with LCD Cleaning Cloth
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memores optidisk laser lens cleaner unboxing
How do I clean the lens/laser on my computer?
My cd/dvd drive isn't working. I have tried EVERYTHING but a system restore and cleaning the lens. I can't buy one of those cd's that clean your lens because my drive won't spin the cd/dvd. I would need to get to the lens myself. Is this easy? I have a Compaq desktop. Thanks for any input!
if it wont spin any cds/dvds possible the motor is burnt out?as for cleaning the lens if you want to 30%vinger and 70% water is what i would use al you have to do is pull it out and take out the screwes on the bottom its just a shell case around it is fairly spimple but if you are not comfatable lets say installing ram or a psu i would not try it
Align Lens Why doesn't my contact lens stay in place?
Like one of my contact lenses, when I put it on, It slowly starts to move to the bottom of my eye. Half of it is on the iris, I push it back so its exactly aligned with the iris, but then it goes down again.
I dunno if theres something wrong, or is there anything I can do to stop this?
oopsies, i didn't mean to put in in the photography section.
there might be some obstruction in your eye or on the lens. Try washing it again and putting them in . If that doesn't work, try a different pair.
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Swarovski UCA digiscoping adapter: compact point & shoot cameras
Are there contact lenses with prisms in them?
I wear glasses that have a prism to align my lazy eye to my good eye. I was wondering if there are any contact lens options for me, and also if they will physically align my eyes - so I don't look crosseyed to other people.
No and no. You are pretty much stuck with glasses.
a total of 31 dark Newton's rings ( not counting the dark spot at the center) appear when 589nm light falls normally on a certain plano-convex lens resting on a flat glass surface. how much thicker is the center than the edges?
If we assume the edge is where the 31st dark ring shows, then we can use this formula, where N = 31 and lambda is the wavelength:
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Plano Convex Lens
What radius of curvature is required?
A plano-convex lens is to have a focal length of 40 cm. It is made of glass of index of refraction 1.65. What radius of curvature is required?
a.13 cm
b.26 cm
c.32 cm
d.36 cm
Lens maker's formula: 1/f = (n - 1)(1/R1 - 1/R2)
For plano-convex 1/R2 = 0 so that:
1/f = (n - 1) / R1 or R1 = f(n - 1) = 40(.65) = 26cm. The answer is b. 26cm
