Explore how cathode rays interact with thin metal films, revealing how reflection and transmission change with film thickness and electrical potential.

This classic study investigates what happens to cathode rays when they strike thin metallic layers. The research compares two ways to measure reflection: tracking the charge carried by reflected rays, and measuring the brightness of fluorescence from the reflected beam. The work asks whether reflection occurs mainly at the surface or from deeper layers inside the metal, and how the amount reflected might change as the film becomes thinner or as the applied voltage changes.

Two experimental approaches are used. One follows the electrical method, where a galvanometer detects the current related to the reflected and absorbed rays. The other uses a photometric method, using fluorescence as a proxy for the quantity of reflected radiation. By comparing results for thin films with those from thicker plates, the study aims to determine how reflection depends on film thickness and surface effects, and whether deeper layers contribute to reflection at higher potentials. The apparatus involves a careful arrangement to measure transmission and reflection while controlling for diffraction and interference, ensuring the measured changes arise from the film itself.

Two measurement strategies to quantify reflection and transmission of cathode rays
Investigation into whether surface reflection vs. deeper-layer reflection dominates
Effect of film thickness and electrical potential on reflection coefficients
Methodological attention to minimizing diffraction and interference in the setup

Ideal for readers with an interest in early 20th‑century physics, electron optics, and the experimental methods used to probe the behavior of cathode rays at very small scales.

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