Final answer:
In the event of a tube failure in a physics experiment, the strips go to their respective positions based on the increment set for the strip.
Step-by-step explanation:
When a tube fails in a physics experiment, the strips (also known as wavelength strips) go to their respective positions based on the increment set for the strip. The increment set for the strip depends on the experiment being conducted and the specific purpose of the strips. For example, in an experiment measuring spectral lines, each strip represents a different wavelength. If a tube fails, the corresponding strip would need to be set to the correct position according to the increment specified for that strip.