Question

Why observable interference fringe pattern cannot be obtained by using two incoherent
sources in an interference experiment? Justify your answer.

Answer 1

The interference pattern will can't obtain by using two incoherent source of light because,

•  Two independent sources of light can't emit waves continuously.
• The waves emitted by two independent sources of light do not have same phase or a constant phase difference.
• Two sources of wave will called as the monochromatic if both the two wave have the same frequency and same wavelength.
• Two incoherent wave have the different phases with irregular pattern.