File:EB1911 Vision - Ophthalmometer of Helmholtz.jpg
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 01:13, 18 September 2021 | 352 × 925 (79 KB) | Bob Burkhardt | {{Information |description = {{en|1=Ophthalmometer optical principles: When a luminous ray traverses a plate of glass having parallel sides, if it fall perpendicular to the plane of the plate, it will pass through without deviation; but if it fall obliquely on the plate (as shown in the left-hand diagram in the figure) it undergoes a lateral deviation, but in a direction parallel to that of the incident ray, so that to an eye placed behind the glass plate, at the lower A, the luminous point,... |
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