Posted by **katherine** on Friday, May 22, 2009 at 3:31am.

What is the approximate magnification of a compound microscope with objective and eyepiece focal lengths of 0.3 cm and 3.6 cm, respectively, and a separation between lenses of 20 cm?

The answer is 460.

I tried finding the magnification for the eyepiece which was m=25/f=25/3.6=6.94.

For the objective lens I tried to solve for q by 1/20 + 1/q = 1/.3 and solved for magnification of objective lens to be m=-q/p.. but i didn't get the correct answer.. is the given value of 20cm=p? i think that's where i went wrong.

- Science -
**Writeacher**, Friday, May 22, 2009 at 8:32am
Assistance needed.

Please type your __subject__ in the **School Subject** box. Any other words are likely to delay responses from a teacher who knows that subject well.

- objective and eyepiece lens -
**bobpursley**, Friday, May 22, 2009 at 9:27am
A resonable approximation for magnification of a microscope is

M= L/f0 * 25/fe

See:http://hyperphysics.phy-astr.gsu.edu/hbasees/geoopt/micros.html

With that approximation, I get

M= 20/.3*25/3.6=463 and it has to be rounded to two sig figures.

- objective and eyepiece lens -
**Anna**, Tuesday, February 16, 2016 at 10:37pm
Within a compound microscope, the objective and eyepiece have focal lengths of 0.9 cm and 2.5cm respectively. The distance between the eyepiece and objective is 23.2 cm. A real image formed by the objective is 17 cm from the objective. Where is the object located?

## Answer This Question

## Related Questions

- physics - The distance between the lenses of a microscope is 18 cm. The focal ...
- Physics Help Please --- Telescope - An astronomical refracting telescope is ...
- physics - A telescope that has a 100 cm focal length objective and a 3.00 cm ...
- physics - A trucker sees the image of a car passing her truck in her diverging ...
- physics - a compound microscope has an eyepiece of focal length 10 c.m and an ...
- Physics - A telescope has a magnification of 20 and consists of two converging ...
- physics - Galileo's first telescope used a convex objective lens with a focal ...
- lenses, still stuck! - I need to calculate the magnification, m of an objective ...
- physics, lenses - I need to calculate the magnification, m of an objective lens...
- biology - If a microscope has a 40× objective lens in place and a 15× eyepiece ...

More Related Questions