Answer to Question #164390 in Optics for Tony

Question

 An essential condition for interference to be observable between wave trains originating from

two sources is that the sources should be coherent. Explain what is meant by coherent in this text.

How did Young achieve this condition in his experiment ? 

Answer 1

Answer

 According to optics Coherent source of light are sources of light which emit light waves of same wavelength, same frequency and are in same phase or having constant phase difference.

We know In the Young's double slit experiment, two coherent sources were generated using diffracted light from a single slit.