Calculate the total magnification for the lens combinations: Scanning power: eyepiece times objective Low power: eyepiece times objective High power: eyepiece times objective Oil immersion: eyepiece x times objective
The Correct Answer and Explanation is:
The total magnification of a microscope is calculated by multiplying the magnification power of the eyepiece lens by the magnification power of the objective lens. Here’s how the magnification is calculated for each lens combination:
1. Scanning Power:
- Eyepiece magnification: Typically 10x.
- Objective magnification: Usually 4x for scanning power.
- Total Magnification = Eyepiece Magnification × Objective Magnification = 10x × 4x = 40x.
2. Low Power:
- Eyepiece magnification: 10x.
- Objective magnification: 10x for low power.
- Total Magnification = Eyepiece Magnification × Objective Magnification = 10x × 10x = 100x.
3. High Power:
- Eyepiece magnification: 10x.
- Objective magnification: 40x for high power.
- Total Magnification = Eyepiece Magnification × Objective Magnification = 10x × 40x = 400x.
4. Oil Immersion:
- Eyepiece magnification: 10x.
- Objective magnification: 100x for oil immersion.
- Total Magnification = Eyepiece Magnification × Objective Magnification = 10x × 100x = 1000x.
Explanation:
- The eyepiece lens (ocular lens) typically has a magnification of 10x. This is what you look through when observing the specimen.
- The objective lenses are the lenses located on the rotating turret and are labeled with different magnifications, such as 4x, 10x, 40x, and 100x. These lenses are used to zoom in on the specimen at various levels of magnification.
- Scanning power uses the lowest magnification (4x objective), which is ideal for locating a specimen.
- Low power (10x objective) provides a wider field of view and is used for general examination.
- High power (40x objective) is used for detailed examination of a specimen, providing more magnification and finer resolution.
- Oil immersion (100x objective) uses a special oil to increase resolution at very high magnification levels, as it helps to minimize light refraction and allows for clearer images.
Each of these magnifications is multiplied by the 10x eyepiece, resulting in the total magnification. This is essential when working with microscopes for biological, chemical, or material science research.
