1. Objective Lens:
* Primary magnification: The objective lens is the lens closest to the specimen. It is responsible for the initial magnification of the object.
* How it works: The objective lens uses a convex (curved outwards) shape. Light rays from the specimen pass through the objective lens, causing them to converge and form a larger, inverted, real image. This image is then projected into the body tube of the microscope.
2. Eyepiece Lens:
* Secondary magnification: The eyepiece lens is the lens you look through. It further magnifies the image produced by the objective lens.
* How it works: The eyepiece lens also acts as a convex lens. It receives the image from the objective lens and further magnifies it. Since the image produced by the objective lens is real, the eyepiece lens forms a virtual, upright, and magnified image that you see.
Overall:
The magnification power of a microscope is determined by multiplying the magnification of the objective lens by the magnification of the eyepiece lens. For example, if an objective lens magnifies 40x and the eyepiece lens magnifies 10x, the total magnification is 400x.
Simple vs. Compound Microscopes:
* Simple microscopes use a single lens for magnification.
* Compound microscopes, which are more common, use multiple lenses (objective and eyepiece) to achieve higher magnification.
Important note: While lenses magnify the image, they also affect the resolution (the ability to distinguish between two closely spaced objects). Higher magnification doesn't always mean better resolution. To improve resolution, microscopes use other techniques like immersion oil or specialized lenses.
