File:Optical interference test between float glass and plate glass.png
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Summary
| Description |
English: A flatness test of a piece of 9--14λ plate glass, taken from a picture frame. The upper photo shows the plate glass (8x10 inches)in contact with a 4--6λ float-glass optical window (2 inches square) @ 450 nm. The lower left photo shows the plate glass being tested with a λ/10 optical flat (2 inch diameter), while the lower right photo shows two pieces of the same plate glass, cut into 1 inch squares. The optical flat shows a flatness of 9--14λ for the piece of plate glass (at 520 nm), while the test with the float glass surface measures only 5--9λ. When the two pieces of plate glass are put together (@ 450 nm), the test shows near perfect flatness, warping a little only because of the minimal thickness of the material (1/16 inch for the plate glass, 1/8 inch for the float glass and 1/2 inch for the optical flat). |
| Date | 4/6/2017 |
| Source | Own work |
| Author | Zaereth |
Licensing
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File history
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 21:05, 11 April 2017 | | 1,805 × 1,769 (3.3 MB) | Zaereth | Added other test surfaces to the plate glass for comparison |
| 07:11, 7 April 2017 |  | 1,805 × 1,133 (2.42 MB) | Zaereth | User created page with UploadWizard |
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