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:
To calculate the total magnification for various lens combinations, we simply multiply the magnification of the eyepiece (ocular lens) by the magnification of the objective lens. Each lens type (scanning power, low power, high power, and oil immersion) has its own magnification value for both the eyepiece and the objective lens.
1. Scanning Power:
- Eyepiece Magnification: 10x (This is typical for most microscopes.)
- Objective Lens Magnification: 4x (Scanning lens)
- Total Magnification: Eyepiece × Objective = 10x × 4x = 40x
2. Low Power:
- Eyepiece Magnification: 10x
- Objective Lens Magnification: 10x (Low power lens)
- Total Magnification: Eyepiece × Objective = 10x × 10x = 100x
3. High Power:
- Eyepiece Magnification: 10x
- Objective Lens Magnification: 40x (High power lens)
- Total Magnification: Eyepiece × Objective = 10x × 40x = 400x
4. Oil Immersion:
- Eyepiece Magnification: 10x
- Objective Lens Magnification: 100x (Oil immersion lens)
- Total Magnification: Eyepiece × Objective = 10x × 100x = 1000x
Explanation:
Microscopes typically use different objective lenses to achieve varying magnifications, allowing the user to view specimens at different levels of detail. The eyepiece is a fixed magnification lens (often 10x) that works in conjunction with interchangeable objective lenses to provide the total magnification.
- Scanning Power (4x objective): This is the lowest power lens used to locate the specimen. The total magnification is relatively low (40x).
- Low Power (10x objective): This provides a broader field of view and is useful for examining larger portions of the specimen. The total magnification is 100x.
- High Power (40x objective): This lens offers more detail and is used for finer examination of the specimen. The total magnification is 400x.
- Oil Immersion (100x objective): The oil immersion lens is used for viewing very fine details and is especially useful for high-resolution imaging of tiny specimens. The total magnification is 1000x.
By combining the eyepiece with various objective lenses, different levels of magnification are achieved, enabling detailed observation of specimens under the microscope.
