optical telescope
That would be the Newtonian reflector.
Refracting Telescope.
Refracting
Convex lenses are used for glasses since it can bend light to provide better eyesight. Their also used for cameras, telescopes or science purposes. Also you have double convex lens in your eye.
A microscope is a scientific instrument with one or more lenses that enhances the view of smaller objects, for example, microorganisms (bacteria) and microsopic materials, which are too small to be seen with the naked eye. The eyepiece lens and objective lenses able to zoom in and out to enlarge and observe the specimens more clearly, with the objective lenses having a much better zoom-in ability. The eyepiece lens is at the top where you look into to observe the specimen. There are usually 3 or 4 objective lenses on a microscope held by a revolving nosepiece/turret, consisting of different times of zoom-in, e.g. 40x, 100x, 400x.... Also, there is a fine focus knob and a coarse focus knob. The coarse focus is for moving the objective lenses nearer/further away from the specimen while the fine focus is for fine-tuning the focus (usually when it is unclear). Use the coarse focus before the fine focus unless there is no need to zoom in on the specimen. Finally, an illuminator might shine a light on the specimen so that you can see it more easily.
The focus is the location where everything come together at. It is a term primarily used in wave mechanical systems like: optics, water management, and geological phenomena. glass lenses such as a magnifying glass can bend light to a focal point. shoreline cliffs can focus waves so that their height and troughs are additive in intensity seismic wave (earthquakes) can be focused to devastating effect.
the reflecting telescope uses mirrors and lenses. The refracting telescope does not include the mirrors.
Optical!!
the reflecting telescope uses mirrors and lenses. The refracting telescope does not include the mirrors.
The Hubble Telescope uses both mirrors and lenses to focus on images.
A telescope uses lens and mirrors to collect and focus light from distant object.
Newtonian telescope
Mirrors and lenses in telescopes bend and focus light to produce an image with more detail.
A single-mirror reflector.
That device is a telescope.
Refracting telescope.
Mirrors don't refract, they reflect. All lenses, on the other hand, refract (bend) the light. All cameras have lenses, to focus the image; same for eyeglasses. Some telescopes have lenses, but others are collections of mirrors. Note that some few optical elements are lenses and mirrors - like prescription sunglasses with mirror coating.
Refracting Telescope.