Optical Mounts Mirror How many degrees has the cylinder rotated?
You’re helping with an experiment in which a vertical cylinder will rotate about its axis by a very small angle. You decide to use what is called an optical lever. You begin by mounting a small mirror on top of the cylinder. A laser 5.0 m away shoots a laser adjusted to reflect the laser beam directly back to the laser. Before your experiments starts, the mirror is adjusted to reflect the laser beam directly back to the laser. Later, you measure that the reflected laser beam, when it returns to the laser, has been deflected sideways by 2.0 mm. How many degrees has the cylinder rotated?
actually you need a diagram. but i will try to give the answer. here by principles of reflection, when the reflecting surface turns by some angle, the reflected ray will be truned by twice the angle. then,
tan( 2 theta) = x / D, where 'theta' is the angle of deflection, x is the deflection of the beam and D is the distance of the source.
hence, tan( 2 theta) = 2x10^-3 / 5 then theta = 0.005 radain
= 0.2866 degrees.
(rotatation of the cylinder)
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Im thinkin about either buyin a Meade 70AZ-USB Telescope with USB Color Camera with 70mm diameter lens and
2 premium 1.25" eyepieces or a Bushnell 4.5" Reflector Telescope with Classic shorttube design for ease of use
Reflector style telescope
Red dot finder scope
4.5" mirror
All aluminum tripod
Includes two eyepieces
1.25 " eyepiece
500mm focal length
120X max. magnification
according to walmart
or a Meade Telestar RB-60 Telescope with
2-element coated 60mm optical glass objective lens with smooth single arm mount
Manual slow motion controls
700mm focal length
Fully adjustable aluminum tripod with accessory tray
Includes two 1.25" eyepieces for low and medium power according to walmart? I am not an astronomer but would like to start out observing the universe (planets, stars, and moons). I want to get something that i can use for my first 1 or 2 years. Is a refractor telescope better for my job or a reflector.
Never, ever buy from Walmart, Coatco, Target, or any other discount store like that. Junk scopes are flooded into the market from those stores. You will be buying nothing but bad optics and plastic.
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http://oriontelescopes.com/
Orion is the very best for value and for customer service to. I have 2 of their scopes and I will only buy from them from now on.
Things to consider are size--can the user lift and transport the scope to the viewing site easily? If not, then it will gather dust in a closet. Can the viewer reach all the knobs and buttons? I have a long tube large manual refractor and it is very dificult for me to reach the knobs when I am pointed to Zenith. I am not a tall person.
Take your time in making your decision.
I would like to suggest that you join a local astronomy club or astronomical society BEFORE you spend your money on a scope. There are many different kinds of scopes and what is perfect for one person is not perfect for another. Everyone has their own set of eyeballs and no two are the same. If you join a club, you can attend a few of their star parties and try out members scopes to see what works best for you before you buy a scope. The members can also help you when you get your scope and show you how to get the most out of your new scope. Hint: they will be especially helpful if you take cookies to star parties.
Some people will suggest that you purchase binnoculars. Not a bad idea but dont buy anything less than 10x50 and you must have a tripod too or you will not be happy with your astronomical views because they will be too shakey from your movements. Personally, I prefer a scope to binos.
But when you buy go Orion and you wont be disappointed.
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