Question

How is the backlash error avoided in Newton's ring experiment?

Answer 1

A thin air film is formed between the plate and the lens. ... If the lens plate system is illuminated with monochromatic light falling on it normally, concentric bright and dark interference rings are observed in reflected light. These circular fringes were discovered by Newton and are called Newton's rings.

Answer 2

Answer:

The backlash error in Newton’s ring experiment can be avoided by moving the cross-wire unidirectional like from left to right when the data is recorded.

Explanation:

• Newton’s ring is an “interference pattern” which is formed by the light reflection in between “a spherical surface and a flat surface”.
• Concentric circles of dark light waves of different wavelengths can be observed.
• This experiment is done to measure the “wavelength of the monochromatic light” from a given source.
• So while observing the rings during the experiment, the travelling microscope should be rotated only in one direction to avoid backlash errors.