Optics

rb.russell1
Mind Map by rb.russell1, updated more than 1 year ago
rb.russell1
Created by rb.russell1 over 6 years ago
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Unit 1: optics for OCR B

Resource summary

Optics
  1. Light
    1. ray
      1. shows direction of travel
      2. wavefronts
        1. show wavelength
        2. refraction
          1. wave changes
            1. speed
              1. direction
                1. @ boundary
                  1. between mediums
                    1. less dense -> more dense
                      1. wavelength shortens
                        1. bends toward normal
                        2. more dense -> less dense
                          1. wavelength increases
                            1. bends away from normal
                      2. wavelength
                    2. refractive index, n
                      1. high
                        1. light bent more
                          1. @greater angle
                        2. speed of light in vacuum, c
                          1. ÷ speed of light in medium
                            1. 3 x10^8 m/s
                        3. Curvature
                          1. measure of how curvy
                            1. Dioptres, D
                            2. up distance from source
                              1. down curvature
                              2. plane wave
                                1. 0 curvature
                                  1. distant source
                                2. converging
                                  1. +ve
                                    1. becomes more curved
                                      1. convex lens
                                        1. adds curvature
                                          1. C added= Power
                                            1. thicker
                                              1. more power
                                    2. diverging
                                      1. -ve
                                        1. becomes less curved
                                        2. incoming waves
                                          1. 1/u always -ve
                                      2. Magnification
                                        1. image size
                                          1. ÷ object size
                                          2. congruent
                                            1. triangles
                                            2. no units
                                              1. if M>1
                                                1. image larger
                                                  1. object smaller
                                                2. if M<1
                                                  1. image smaller
                                                    1. object larger
                                                3. Pinhole cameras
                                                  1. single
                                                    1. small
                                                      1. focused image
                                                        1. dim
                                                        2. inverted
                                                        3. large
                                                          1. blurred image
                                                            1. bright
                                                            2. inverted
                                                          2. double
                                                            1. small
                                                              1. 2 inverted images
                                                                1. clear
                                                                  1. not as clear as single
                                                          3. Resolution
                                                            1. of an image
                                                              1. size
                                                                1. smallest detaill
                                                              2. pixel
                                                                1. smallest detail
                                                                  1. digital image
                                                                    1. CCD
                                                                      1. charge-coupled device
                                                                        1. array
                                                                          1. tiny light receptors
                                                                            1. represent each pixel
                                                                              1. records
                                                                                1. light intensity
                                                                                  1. to build inverted image
                                                                                  2. wavelength
                                                                      2. object size
                                                                        1. ÷
                                                                          1. no. of pixels
                                                                            1. (in 1 dimension)
                                                                              1. units (m/pixel)
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