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Class 12 Exam > Class 12 Videos > L47 : Compound Microscope - Ray Optics, Physics, Class 12

L47 : Compound Microscope - Ray Optics, Physics, Class 12 Video Lecture

FAQs on L47 : Compound Microscope - Ray Optics, Physics, Class 12 Video Lecture

1. What is a compound microscope and how does it work?

Ans. A compound microscope is an optical instrument that is used to magnify small objects or specimens. It works by using two lenses, an objective lens and an eyepiece lens. The objective lens collects light from the specimen and forms a real and enlarged image, which is further magnified by the eyepiece lens for the viewer's observation.

2. What is the role of ray optics in a compound microscope?

Ans. Ray optics plays a crucial role in a compound microscope as it helps in understanding the path of light rays as they pass through the different lenses and interact with the specimen. It helps in determining the magnification, resolution, and image formation in the microscope.

3. How is the magnification of a compound microscope calculated?

Ans. The magnification of a compound microscope is calculated by multiplying the magnification of the objective lens and the eyepiece lens. The magnification of the objective lens is typically written on the barrel of the lens, while the eyepiece lens usually has a fixed magnification of 10x. Therefore, the total magnification is given by the product of the two magnifications.

4. What is the significance of numerical aperture in a compound microscope?

Ans. Numerical aperture (NA) is a measure of the ability of an optical system, such as a compound microscope, to gather and resolve fine details of a specimen. It is determined by the refractive index of the medium between the objective lens and the specimen, as well as the angle at which light rays enter the objective lens. A higher numerical aperture allows for better resolution and higher magnification.

5. How can one improve the resolution of a compound microscope?

Ans. The resolution of a compound microscope can be improved by using a shorter wavelength of light, increasing the numerical aperture of the objective lens, and using immersion oil with a higher refractive index. Additionally, adjusting the focus properly and using high-quality lenses can also contribute to better resolution.

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