it would be 15 times 40 which is 600 times magnification
The focal length of the main optical system and the focal length of the lens forming the image.
the objective lens has the power of that lens inscribed on it
The term compound microscope normally refers to a light microscope that uses two or more lenses to magnify objects. (Two lenses does not refer to the number of eye pieces as does the term binocular microscope.) This is to be distinguished from a simple light microscope with a single lens. There are many modern variations of the light microscope which have more specialized names but which may still be "compound" with the meaning that they have multiple stages of magnification. See related links.
Good for what? Telescope? Microscope? "Magnification" is often used as a marketing tool; telescopes for example might come with a maximum magnification that is too big to get a clear image, just so they can claim "100x magnification" or whatever. And it is cheap to get a magnification that is clearly too much. The most important piece of information about a telescope is, how big is the main lens, or the main mirror. A larger diameter here will give you (a) more light-gathering power, allowing you to see fainter stars, and (b) more resolution, roughly equivalent to usefulmagnification.Good for what? Telescope? Microscope? "Magnification" is often used as a marketing tool; telescopes for example might come with a maximum magnification that is too big to get a clear image, just so they can claim "100x magnification" or whatever. And it is cheap to get a magnification that is clearly too much. The most important piece of information about a telescope is, how big is the main lens, or the main mirror. A larger diameter here will give you (a) more light-gathering power, allowing you to see fainter stars, and (b) more resolution, roughly equivalent to usefulmagnification.Good for what? Telescope? Microscope? "Magnification" is often used as a marketing tool; telescopes for example might come with a maximum magnification that is too big to get a clear image, just so they can claim "100x magnification" or whatever. And it is cheap to get a magnification that is clearly too much. The most important piece of information about a telescope is, how big is the main lens, or the main mirror. A larger diameter here will give you (a) more light-gathering power, allowing you to see fainter stars, and (b) more resolution, roughly equivalent to usefulmagnification.Good for what? Telescope? Microscope? "Magnification" is often used as a marketing tool; telescopes for example might come with a maximum magnification that is too big to get a clear image, just so they can claim "100x magnification" or whatever. And it is cheap to get a magnification that is clearly too much. The most important piece of information about a telescope is, how big is the main lens, or the main mirror. A larger diameter here will give you (a) more light-gathering power, allowing you to see fainter stars, and (b) more resolution, roughly equivalent to usefulmagnification.
In standard film camera reference which is commonly used, a 50 mm lens equals a neutral value, or 1x magnification, so a 12x lens would be 600 mm.
To determine the magnification of the eyepiece on a microscope take the total magnification for the microscope and divide it by the total magnification of the objective lens. The answer is what the magnification is for the eyepiece.
The ocular lens are 10x magnification. Objective lens are 4x, 10x, 40x, 100x magnification. So once an objective lens is selected, the total magnification would be given by its product with the 10x magnification of the ocular lens. For example, if objective lens selected is 40x, total magnification would be: (10x)(40x)=400x total.
15 * 30 = 450 ------------
the power of the ocular lens multiplied by the magnification of the objective lens
15 * 30 = 450 ------------
To determine the total magnification of a microscope you multiply the magnification power of the objectives lens (indicated as x10) by that of the eye piece.
Total magnification is determined by multiplying the magnification of the ocular lens by that of the objective lens. Compound microscope that uses more than one lens to direct light through a specimen mounted on a glass slide.
To determine the total magnification of an object being viewed under a microscope, multiply the magnification of the ocular lens by that of the objective lens.
Multiply the magnification or power of the objective lens times the power of the eyepiece and it equals the total magnification
The total magnification would be 200x, since the total magnification is the magnification of the objective lens X the magnification of the eyepiece.
Microscopes vary in power. You can determine total magnification by the eyepiece and the lens.
In a light microscope magnification is varied by using different lenses to refract the light. In an electron microscope magnification is varied by altering the configurations of magnetic fields to bend the electron beam.