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18-3 (Lenses (Binoculars (image (Work in the same way as telescopes, The…

- - - - Work in the same way as telescopes
      - The first lens produces a real, inverted images that pass through double prisms where is becomes upright
      - The second convex lens produce a virtual, upright and enlarged image
      - So the final image is upright and enlarged
  - - - Both lenses are convex
      - The first produces a real, inverted and enlarged image, which is the object of the second lens
      - The second produces a virtual, upright and enlarged image
      - The final image is inverted and enlarged according to the original object
  - - - The first lenses image is real, inverted, and enlarged
      - And the second lens is also inverted and enlarged
      - Two convex lenses
  - - - Lens used is convex and achromatic to prevent chromatic aberration
      - Light pass through the lens converged at the mirror where it's reflected upward toward a prism, in the prism a double reflection occur to reflect light to the eyes
      - When we press the button the mirror goes upward blocking the view, and the image is printed on the film
      - To focus on objects that are far, the lens should be closer to the film
  - - - High pass through cornea because the difference in index with air is large
      - Lens focuses the image at the retina
      - accommodation
        
        Muscles surrounding the lens contract and shortens the focal length, to allow us to see near objects, and release to see far objects
      - The image is sent to the brain
      - Vision defects
        
        Myopia (nearsightedness)
        
        Able to see near
        
        Fixed by concave lens
        
        Focal length too short
        
        Hyperopia (Farsightedness)
        
        Able to see far objects
        
        Fixed by concave lens
        
        Focal length too long
        
        Old people suffer from this problem