The retina
You need to specify what model Polaroid. The 100/660 pack is still made, but most of Polaroid's film line has been discontinued and is either unavailable or can only be purchased from boutique manufacturers or online auctions.
A manual camera is a camera that does not have any automated functions, like film transport that winds the film, or exposure modes like shutter or aperture priority. Most manual cameras also do not have auto-focus capability.
35MM cameras were the most popular type of camera before digital cameras came into popularity. The definition of a 35MM camera is one which uses film which measures 35MM.
Until about ten years ago cameras used film -- clear plastic with a coating that is sensitive to light. The camera exposed light from the scene onto the film which was later removed from the camera and put in chemicals to cause the images to appear. This chemical process is called developing the film. Some professional photographers, serious amateurs, and people who have not yet bought a digital camera still use film cameras. I assume these film cameras are what you are calling 'normal.' Digital cameras create images by light from the scene onto electronic sensors which convert the light falling on them to signals that can be recorded in digital files the way computer data is recorded. These files can then be transferred to computers to be printed.
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A manual camera is a camera that does not have any automated functions, like film transport that winds the film, or exposure modes like shutter or aperture priority. Most manual cameras also do not have auto-focus capability.
You can find polaroid film for your mini 8 camera at most camera stores, electronics retailers, or online on websites like Amazon or the official Fujifilm website.
You can purchase instax mini refill film for your camera at most major retailers, such as electronics stores, camera shops, and online retailers like Amazon or BH Photo.
You can purchase instax mini 8 film paper for your camera at most major retailers, such as electronics stores, camera shops, and online retailers like Amazon or BH Photo Video.
You can purchase instax sticker film for your instant camera at most major retailers that sell photography supplies, as well as online through websites like Amazon or the official Fujifilm website.
That will depend on the exact camera and film that you have. Most cameras/film will come with loading instructions, refer to owner's manual. You could also find manuals online.
Camera film can still be found in most stores. Keep an eye out in local flyers to find the best deals. You can also find camera film on amazon and the free shipping threshold is low and easy to reach.
The retina is very similar to the film in a camera. Images come through the eye's lens and are focused on the retina. The retina then converts these images to electric signals and sends them by way of the optic nerve to the back lobe of the brain.
You need to specify what model Polaroid. The 100/660 pack is still made, but most of Polaroid's film line has been discontinued and is either unavailable or can only be purchased from boutique manufacturers or online auctions.
The largest camera aperture is f stop 1.4, which lets the most amount of light into the camera.
The cornea functions like the lens in a camera by refracting (bending) incoming light to help focus it onto the retina, similar to how a camera lens focuses light onto its film or sensor. It provides most of the eye's optical power due to its curvature and transparent nature, allowing clear images to form. Additionally, just as a camera lens can adjust focus to capture sharp images at varying distances, the eye can adapt its focus through the lens (a separate structure) to ensure clarity for objects at different distances.
Hasselblad makes a 50 MP digital back for their film cameras, and produces a 32 MP stand-alone digital camera.