How to use the ophthalmoscope : being elementary instructions in ophthalmoscopy, arranged for the use of students / by Edgar A. Browne.

  • Browne, Edgar A. (Edgar Athelstane), 1841-1917.
Date:
1887
Catalogue details

Licence: Public Domain Mark

Credit: How to use the ophthalmoscope : being elementary instructions in ophthalmoscopy, arranged for the use of students / by Edgar A. Browne. Source: Wellcome Collection.

Provider: This material has been provided by The University of Leeds Library. The original may be consulted at The University of Leeds Library.

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    impinged, it will divide the angle made by the beam into two equal parts. In fig. 2, SAO represents the angle made by the incident and reflected rays, and the angles SAR RAG must be each equal to half a right angle. If the mirror is more inclined, the angles Fig. 2. (with the ruler still placed perpendicularly to the surface) will be larger ; if the inclination is diminished, the angles will be smaller, but the angle on one side of the ruler is always equal to the angle on the other, or, stated as a law : The angle of reflection is equal to the angle of inci- dence. It will also be observed that the incident and reflected beams are in the same plane, which is at right angles to the plane of the mirror.