User contributions for Goodphy

25 July 2024

• 08:0908:09, 25 July 2024 diff hist +1,115‎ Thin lens ‎ →‎Image formation: Added the sign convention used for the Gaussian thin lens equation. current Tag: Visual edit

23 July 2024

• 01:2301:23, 23 July 2024 diff hist +349‎ User talk:Goodphy ‎ →‎Updating images: Expressed appreciation. current Tag: Reply

20 July 2024

• 03:3703:37, 20 July 2024 diff hist +118‎ Entrance pupil ‎ Clarify the description of the definitions of entrance and exit pupil. Tag: Visual edit
• 03:2603:26, 20 July 2024 diff hist +142‎ Exit pupil ‎ →‎Visual instruments: Described why the entrance pupil of the human eye must be aligned with the exit pupil of an optical instrument to get full image received by the eye. Tag: Visual edit
• 03:1203:12, 20 July 2024 diff hist +69‎ Entrance pupil ‎ Generalize sentences. Tag: Visual edit

18 July 2024

• 00:3600:36, 18 July 2024 diff hist 0‎ Entrance pupil ‎ Slightly update a figure to show a mark "lens" clearer by moving it to the front in the figure. Tag: Visual edit
• 00:3300:33, 18 July 2024 diff hist 0‎ Ray (optics) ‎ →‎Optical systems: Slightly update a figure to show a mark "lens" clearer by moving it to the front in the figure. current Tag: Visual edit
• 00:2700:27, 18 July 2024 diff hist 0‎ Ray (optics) ‎ →‎Optical systems: Updated a figure to clarify rays in colors. Tag: Visual edit
• 00:2600:26, 18 July 2024 diff hist 0‎ Entrance pupil ‎ Updated a figure to clarify rays in colors. Tag: Visual edit

17 July 2024

• 07:0907:09, 17 July 2024 diff hist 0‎ Entrance pupil ‎ Replace an image with an image having a mark "optical axis". Tag: Visual edit

12 July 2024

• 23:3223:32, 12 July 2024 diff hist +35‎ Focal length ‎ →‎General optical systems: Clarify the side of view to determine the convexity of spherical mirrors Tags: Reverted Visual edit
• 23:0323:03, 12 July 2024 diff hist +55‎ Focal length ‎ →‎General optical systems: Clarified the side of viewing the lens that determines the convexity. Tags: Reverted Visual edit

10 July 2024

• 23:0023:00, 10 July 2024 diff hist +29‎ Focal length ‎ →‎General optical systems: Make a proper link. Tag: Visual edit
• 22:4322:43, 10 July 2024 diff hist +191‎ Focal length ‎ →‎General optical systems: Added a source for the lensmaker's equation. Tag: Visual edit

27 June 2024

• 03:3003:30, 27 June 2024 diff hist +51‎ Entrance pupil ‎ In the first figure, added a fact that the location and size of the pupil are determined by chief rays and marginal rays. Tag: Visual edit

24 June 2024

• 22:5422:54, 24 June 2024 diff hist +178‎ Ray (optics) ‎ →‎Optical systems: Replace a figure showing chief and marginal rays with a more proper image. Tag: Visual edit

23 June 2024

• 23:4423:44, 23 June 2024 diff hist +115‎ Entrance pupil ‎ Update the figure showing an entrance pupil with chief and marginal rays. Tag: Visual edit

20 June 2024

• 00:4500:45, 20 June 2024 diff hist 0‎ Entrance pupil ‎ Improve a sentence to clarify which object is talked about by an image. Tag: Visual edit

12 June 2024

• 23:0023:00, 12 June 2024 diff hist +68‎ Lens ‎ →‎Compound lenses: Improved two sentences with slight modification. Tag: Visual edit

10 June 2024

• 23:0423:04, 10 June 2024 diff hist −2‎ Lens ‎ →‎Compound lenses: Removed unnecessary spaces. Tag: Visual edit
• 23:0223:02, 10 June 2024 diff hist +439‎ Lens ‎ →‎Compound lenses: Added a fact that the expression of the optical power of an optical system where lenses are in contact also hold for thick lenses in contact. Tag: Visual edit

5 June 2024

• 23:1423:14, 5 June 2024 diff hist +294‎ Cardinal point (optics) ‎ →‎Nodal points: Improved sentences for clear reading. Tag: Visual edit
• 22:3922:39, 5 June 2024 diff hist +7‎ m Focal length ‎ →‎General optical systems: Clarified terms. Tag: Visual edit
• 22:2122:21, 5 June 2024 diff hist +127‎ Cardinal point (optics) ‎ →‎Nodal points: Added meaning of each terms in a figure. Tag: Visual edit

2 June 2024

• 03:3503:35, 2 June 2024 diff hist +248‎ Paraxial approximation ‎ Added a fact that the small-angle approximations are in dimensionless as they are approximations of trigonometric functions. Tag: Visual edit

31 May 2024

• 13:1313:13, 31 May 2024 diff hist +856‎ Lens ‎ →‎Imaging properties: Added how the Newtonian form of the lens equation can be derived. Tag: Visual edit

18 May 2024

• 02:0902:09, 18 May 2024 diff hist +1,145‎ m Ray tracing (physics) ‎ →‎Optical design: Added an optical ray tracing technique called Focal-Plane Ray Tracing. current Tag: Visual edit

12 May 2024

• 22:4122:41, 12 May 2024 diff hist +56‎ Lens ‎ →‎Compound lenses: Little more elaborate sentences. Tag: Visual edit
• 00:4500:45, 12 May 2024 diff hist +517‎ Exponential smoothing ‎ In the introductory section, mentioned that the double and triple exponential smoothing can be used for the prediction (while the simple exponential smoothing is not.) Tag: Visual edit

5 May 2024

• 03:5403:54, 5 May 2024 diff hist −4‎ Exponential smoothing ‎ →‎Triple exponential smoothing (Holt Winters): Remove unnecessary empty spaces and make a word time series to be a hyperlink to the corresponding Wikipedia page. Tag: Visual edit
• 03:2303:23, 5 May 2024 diff hist +4‎ Exponential smoothing ‎ →‎Triple exponential smoothing (Holt Winters): Make a word time series as a hyperlink. Tag: Visual edit
• 03:1703:17, 5 May 2024 diff hist −1‎ Exponential smoothing ‎ →‎Double exponential smoothing (Holt linear): Remove an unnecessary empty space. Tag: Visual edit

2 May 2024

• 22:5122:51, 2 May 2024 diff hist 0‎ Exponential smoothing ‎ Replace a capital letter C with a small latter c. Tag: Visual edit
• 08:2908:29, 2 May 2024 diff hist +214‎ Lens ‎ →‎Compound lenses: Added the general formula of multiple thin lenses in contact Tag: Visual edit
• 08:1208:12, 2 May 2024 diff hist +227‎ Lens ‎ →‎Compound lenses: Added how to derive BFD (Back Focal Distance). Tag: Visual edit

29 April 2024

• 22:4222:42, 29 April 2024 diff hist +1,633‎ Lens ‎ →‎Compound lenses: Added how FFD (Front Focal Distance) for a two lenses system is derived. I will also add RFD (Rear Focal Distance) or BFD (Back Focal Distance). Tag: Visual edit

23 April 2024

• 22:4822:48, 23 April 2024 diff hist +123‎ Exponential smoothing ‎ →‎Comparison with moving average: Clarified terms. Tag: Visual edit
• 22:3622:36, 23 April 2024 diff hist +557‎ Exponential smoothing ‎ Added how the name "Exponential smoothing" is named in the introductory section because it is the first question that readers may have. Tag: Visual edit

21 April 2024

• 08:2308:23, 21 April 2024 diff hist +265‎ Exponential smoothing ‎ →‎"Exponential" naming: Added an invisible note showing a requirement of the proof about "A geometric progress is the discrete version of an exponential function.". Tag: Visual edit
• 02:5602:56, 21 April 2024 diff hist +441‎ Exponential smoothing ‎ →‎Choosing the initial smoothed value: Added some detailed explanations on terms to narrow information search range for readers. Tag: Visual edit

18 April 2024

• 22:4422:44, 18 April 2024 diff hist +1,016‎ Lens ‎ →‎Compound lenses: Added a fact that for a multiple-lenses system the imaging is cascaded through the lenses. Tag: Visual edit

17 April 2024

• 22:5822:58, 17 April 2024 diff hist +235‎ Exponential smoothing ‎ →‎Basic (simple) exponential smoothing: Added a limiting case of alpha = 0. Tag: Visual edit

15 April 2024

• 22:5622:56, 15 April 2024 diff hist +87‎ Exponential smoothing ‎ →‎Time constant: Mentioned the Taylor expansion of the exponential function to show how an approximated expression for deltaT << tau is made. Tag: Visual edit

20 March 2024

• 22:4122:41, 20 March 2024 diff hist −46‎ Variance ‎ →‎Example: Added which functions in Excel gives unbiased sample / population variance, and removed a confusing sentence. Tag: Visual edit

18 March 2024

• 22:3022:30, 18 March 2024 diff hist +67‎ Power Pivot ‎ Added a fact that measures can also play as fields in pivot tables. Tag: Visual edit

11 March 2024

• 22:3122:31, 11 March 2024 diff hist +451‎ Performance indicator ‎ Added a fact that KPI is not only used for business organizations but also for machines. Tag: Visual edit

6 March 2024

• 22:5722:57, 6 March 2024 diff hist +142‎ Power Pivot ‎ added what measures are. Tag: Visual edit

5 March 2024

• 22:4322:43, 5 March 2024 diff hist −13‎ Lens ‎ →‎Imaging properties: Removed an unnecessary word "therefore" and empty spaces in an invisible comment. Tag: Visual edit

24 February 2024

• 10:0510:05, 24 February 2024 diff hist +368‎ Virtual image ‎ Added a concept of virtual object Tag: Visual edit

22 February 2024

• 22:5222:52, 22 February 2024 diff hist +139‎ Variance ‎ →‎Distribution of the sample variance: Added S^2 and sigma^2 are the unbiased sample variance and population variance respectively and removed unnecessary empty spaces before and after each mathematical formula in the section Population variance. Tag: Visual edit