projector have concave or convex
You would use a convex lens.
The movie projector uses light to project a picture. These running pictures are what people see when they watch a movie.
which tool is to use to the patterns of an small object
I'd start with a microfiber cloth. If you must use a cleaning compound I would use lens cleaner. If the lens is large enough and you will have to do this regularly you might consider a thing called a lens-pen.
A converging lens is thin at the ends and thick in the middle. It is called converging because the rays of light passing through it, if parallel, converge at a point the other side. A magnifying glass uses a converging lens.
No, a movie projector uses a convex lens.
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.
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
There are many websites that provide DIY projector plans, But none offer a way to repair a Projector Lens. I would look into how much it is to replace the Lens or the projector all together.
The lens focuses light on the retina (fish have one)
place the lens cap in place.
A typical slide projector usually uses one main lens to focus the image onto the screen. However, some models may incorporate additional lenses for zooming or adjusting the image size and focus. Overall, the number of lenses can vary depending on the design and features of the specific projector.
To select a Fresnel lens for a home projector, first determine the desired projection size and distance from the lens to the screen. Look for a lens with a suitable focal length that matches your projection setup, typically around 10-20 inches for small projects. Ensure the lens has a high-quality optical clarity to minimize distortion. Finally, consider the lens size and shape to fit your projector design and housing.
since you need to show the image on a big screen so you require a diverging lens i.e. a concave lens