Physics - August 2007

I have recently taken delivery of a 20X microscope objective that I will be using to expand my reference beam for holography. At some point in the future (when budget allows), I will be incorporating said objective into a spatial filter. In determining pinhole size necessary, I will need to know the focal length of my objective.

Specs I know so far:

532nm
1.5mm beam
20X microscope objective

How do I determine the focal length of the lens in question? It is not marked with anything except 20/0.40...

2007-08-22 08:53:35 · 1 answers · asked by nowyermessingwithasonofabitch 4

2007-08-22 08:48:33 · 1 answers · asked by deannahndrsn 2

2007-08-22 08:30:50 · 8 answers · asked by Anonymous

2007-08-22 08:23:02 · 6 answers · asked by nimrod3316 1

2007-08-22 08:19:03 · 5 answers · asked by Alexander 6

I'm taking multivariable calculus and the prof didn't teach us how to use this function and it is not described in my textbook but it appears in one of the homework problems where it gives a short description before the actual problem where it gives a symbol like "[" (without the bottom line on the bracket) "is a gamma function" what is this and how do I evaluate this function?
I will post this question on the math forum as well.

2007-08-22 08:12:50 · 3 answers · asked by claire_is_my_name 3

2007-08-22 08:07:28 · 2 answers · asked by Monkey Man 3

2007-08-22 07:50:00 · 6 answers · asked by Alexander 6

Empty trucks (m=5 tonnes) arrive at speed 30 km/s, load 15 tonnes of ore, and depart at speed 20 mph.

Period of the bumps on the road leading to the quarry is about 12m.
What is period of bumps on the road leading out of the quarry?

2007-08-22 07:44:59 · 1 answers · asked by Alexander 6

how the wave equation arises out of Maxwell's Equations? please write as simple as possible so i can get it through my head.

2007-08-22 07:32:16 · 6 answers · asked by Anonymous

On the second picture the rock appears 10m higher than on the first one. At what moment did the rock reached the maximum height, and what was that height?

2007-08-22 07:23:22 · 8 answers · asked by Alexander 6

True or False

2007-08-22 06:56:47 · 2 answers · asked by Anonymous

I don't think it's possible. Here's my theory, picture timespace as a 3d grid much like this http://wwwvis.informatik.uni-stuttgart.d...
now lets say all the lines moving up and down and the one moving left and right are space, the one moving back and forward are time and the whole thing represents the universe. Now lets pick any interse ction and call it point a, that's where you are right now. With the earth rotating and orbiting the sun which is about a third away from the edge of a rotating galaxy, which itself is moving through space or the universe. You will never be at point a again in your life. even is you sat exactly still for exactly one year (use your imagination here) you would probably be in the same spot on earth and maybe the same spot relative to the sun, but the solar system would be in a different part of the galaxy and the galaxy would be in a different part of the universe.

2007-08-22 06:33:39 · 13 answers · asked by orajin666 2

What's the maximum traction a runner, who can exert a force of twice his body weight, can generate on a rough horizontal surface? Leave your answer in terms of the runners mass, the coefficient of friction. What's the corresponding angle at which he must push against the ground?

2007-08-22 06:19:08 · 3 answers · asked by Anonymous

a 60 megaton nuclear bomb was exploded inside the iron cube?

2007-08-22 06:16:51 · 6 answers · asked by curious_inquisitor 1

i keep wondering this, and all my friends keep wondering this things too.

2007-08-22 06:12:53 · 9 answers · asked by <(-^_^-)> 4

If yes, how do you measure it?

2007-08-22 06:08:11 · 4 answers · asked by just thinking 6

...when dropped off a tall building?

would air friction make the two objects make them land at different times??

2007-08-22 05:42:23 · 13 answers · asked by Anonymous

2007-08-22 05:00:40 · 9 answers · asked by peaceboy213 2

2007-08-22 04:40:21 · 15 answers · asked by concentricreducer 2

is it possible to bend light around us or manipulating our DNA or something like that causing us to look invisible?

2007-08-22 04:23:24 · 7 answers · asked by coldfire_blacksheep 2

2007-08-22 03:28:02 · 4 answers · asked by Anonymous

2007-08-22 03:16:59 · 8 answers · asked by tkrishnamohan91 1

a bullet is fired at 280m/s at an angle of elevation 25 degrees. the bullet can be assumed to be fired from the top of a building that is 75m high. Find:

a) the max height that the bullet reaches ( found = 789.42m)
b) the time of flight
c) the range

2007-08-22 02:53:38 · 3 answers · asked by Anonymous

A test rocket is fired vertically upward from a well. A catapult gives it initial speed 80.0m/s at ground level. its engines then fire and it accelerates upward at 4.00m/s^2 until it reached the attitude of 1000m. At that point its engines fail and the rocker goes into free-fall. with the acceleration of -9.80m/s^2

a) how long is the rocket in motion above the ground
b) what is its maximum altitude?
what is its velocity just before it collides with the earth?

for all this you need to consider the motion while the engine is operating separately from the free fall motion

2007-08-22 02:51:23 · 5 answers · asked by Anonymous

64 feet / sec to meter / sec

how do I convert it?

need help. thanks!

2007-08-22 02:50:16 · 4 answers · asked by rachel is blue 1

2007-08-22 02:47:46 · 3 answers · asked by orangejuice 2

HOW DOES an electric motor works??????????????

2007-08-22 01:40:56 · 4 answers · asked by jaya 2

the matters are liquid,solid,gas..and why are we interested in it's changes?

2007-08-22 01:36:59 · 5 answers · asked by Anonymous

2007-08-22 01:04:04 · 5 answers · asked by Kristopher W 1