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In optical testing, interference is used in testing surface quality like: flat surface, spherical surface, roughness of surface etc. Whereas in space applications include Radio astronomy, measuring light intensity, in retrieving images from the telescopes.
The two sources of light must be coherent, i.e., there is a constant phase difference between the light waves emitted by the two sources. (This condition is met only if the two sources are derived from the same source.) The two sources of light must be monochromatic, i.e., the light emitted is of the same wavelength.
To set up a stable and clear interference pattern, two conditions must be met: The sources of the waves must be coherent, which means they emit identical waves with a constant phase difference. The waves should be monochromatic - they should be of a single wavelength.
One of the best examples of the interference of light is demonstrated by the light reflected from a film of oil floating on water. Another example is the soap bubble illustrated in Figure 1 that reflects a variety of beautiful colors when illuminated by natural or artificial light sources.
Conditions for obtaining steady interference patterns are : (a) The two sources of light should be coherent i.e., they should emit light waves having sharply defined phase difference that remains constant with time. (b) The waves emitted by the two sources should have same frequency.