Question

 Write two points of difference between the phenomena of interference and diffraction.

Answer 1

Interference	Diffraction
1	Interference is the phenomenon of waves where waves from two different coherent sources superimpose at a given point and creates fringes.	The phenomenon of bending of light around the corners of an opaque object which obstructs the path of light is called diffraction.
2	In interference pattern the intensity of dark fringe is completely zero.	In diffraction pattern the intensity of secondary minima is minimum, but not completely zero.
3	In interference pattern the width of all the interference fringes is equal.	In diffraction pattern the width of central maxima is large, and on increasing distance, the width of maxima decreases.
4	In interference pattern the intensity of all the bright bands is equal.	In diffraction pattern the intensity of all the secondary maxima is not equal.