(11C) Thin Lens Analysis

10212018, 08:26 PM
Post: #1




(11C) Thin Lens Analysis
Given the distance from the object to the lens (U) and the focal distance (F), the program calculates object from the image from the lens (V) and magnification (M) of the image by the following equations:
V = 1 / (1/F  1/U) M = V / U HP 11C Program: Thin Lens Analysis Note: The keystrokes are also applicable for any HP 11C emulator apps. Code:
Example 1: Input: U = 0.24 ft, F = 0.16 ft Output: V = 0.4800 ft (R/S) M = 2.0000 Example 2: Input: U = 1.5 ft, F = 0.8 ft Output: V ≈ 1.7143 ft, M ≈ 1.1429 Link to blog entry: https://edspi31415.blogspot.com/2018/10/...lens.html 

10232018, 06:20 PM
Post: #2




RE: (11C) Thin Lens Analysis
(10212018 08:26 PM)Eddie W. Shore Wrote: To run: enter U (object distance) then F (focal distance). Then run label C ([ f ] [10^x] (C)). The first result is V (image distance). Press [R/S] to get M (magnification). The program keeps data (U) on the stack, and the stack may be disturbed due to user interaction while the first result is displayed. That's why I suggest removing the R/S command. This way both results, V and M, are returned at the same time in X and Y. Which makes the program safe to use. Note: the program expects the object distance U as user input. Usually distance scales on lenses are calibrated to the sum of object and image distance (U+V) which means that, especially for larger magnifications, the results will differ. Dieter 

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