Letter | Published:

Double-Image Effect in Transparent Microscopic Spheres

Nature volume 119, page 199 (05 February 1927) | Download Citation



IN a paper published by us in the current number of the Proc. Roy. Soc. on the “Scattering of Light by Individual Particles in Smoke,” we have directed attention to a double image effect exhibited by transparent microscopic spheres. As a result of further experiments we have found that the explanation of the effect given requires some modification. One of the images is due to reflection from the surface of the sphere instead of to internal reflection. As was suggested to us by Prof. Tyndall, this can be seen by placing a small bulb containing a gold sol in the beam of light from an arc, when one image is coloured red and may be seen to be due to refraction through the sol, whilst the other is white and is produced by reflection from the surface of the sphere.

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