If you are using the oil immersion objective on a microscope, you must use oil to increase the resolution of the lens. These lens are used at very high magnification.
Because if you use the coarse adjustment under high power, there is a greater risk that you will crack the slide on the microscope and damage it. The fine adjustment only moves the objective lense small amounts and very slowly, so there is no chance that you will damage the slide.
The scanning lens of a compound microscope is used whenever a new slide is viewed or when the view of the specimen in the field of a higher power lens is lost. Think of it as the "neutral" position for the lens array. The scanning lens has the greatest working distance of the lens group on the microscope and is far enough away from the slide to avoid crunching the slide (and possibly damaging the lens) when attempting to focus. Many microscopes are parfocal, meaning that once you have a focused view of the specimen with the scan lens the image will be in, or very near in, focus when you swivel to a higher power lens. Very important! If you can't find a good view at higher power, or you "lose" the specimen after trying to focus with the fine focus knob only, go back to the scanner lens. Never use the coarse focus with anything but the scanner lens in position. Not doing this is probably the number one reason slides get crunched. And everyone will know because it usually makes an unmistakable sound that reverberates all over the lab.
Many astrologers use an optical or a corrector lens.
because it allows you to find the part of the slide you want to see, then you can zoom in by changing focus to see the frame in greater detail. if you don't start in low power it is extremely difficult to move around the slide
projector have concave or convex
No, a movie projector uses a convex lens.
A camera, a photocopier, and a slide projector all use lenses to perform their functions.
Convex lens because i said so
Convex lens because i said so
To make the projector image smaller, you can adjust the lens by moving it closer to the projector. This will focus the light and reduce the size of the image displayed on the screen.
To use the Argus 538 slide projector, first ensure it is properly set up on a stable surface and connected to a power source. Insert the slide tray, making sure the slides are oriented correctly, and adjust the focus knob to achieve a clear image. Turn on the projector, using the power switch, and adjust the lens to project the desired image onto a screen or wall. Finally, use the advance mechanism to switch between slides as needed.
The Automatic 543 is the model of the projector that takes this tray.
Slide projectors are considered "old technology", but if you have slides and a projector, showing them would emphasize that you and your dad predate PowerPoint. And that's not a bad thing.
since you need to show the image on a big screen so you require a diverging lens i.e. a concave lens
Convex lens because i said so
Most slide projectors use mounts that are 50mm x 50mm square with an image that is 24mm x 36mm. The image can either be in landscape view, wider that it is high or in portrait view, higher than it is wide. The shape of the image on a screen is dependant entirely on the way the slide is inserted into the slide magazine or into the gate of the projector. Lenses are no different for the two views.