Define coherent sources.

(i) Define coherent source. (ii) What will be the effect on the width of the central bright fringe in the diffraction pattern of a single slit if : (1) Monochromatic light of smaller wavelength is used. (2) Slit is made narrower.

Which of the following pairs denotes coherent sources?

What are coherent sources of light? Why no interference pattern is observed when two coherent sources are very for apart?

What is meant by coherent sources? What are the two methods for obtaining coherent sources in the laboratory?

What is the importance of coherent sources in the phenomenon of interference?