What are coherent sources of light?

What are coherent source of light? Why no interference pattern is observed when two coherent source are too close

Answer the following: (a) what are coherent sources of light ? Two slits in Young's double slit experiments are illuminated by two different sodium lamps emitting light of the same wavelength. Why is no interference pattern observed? (b) Obtain the condition for getting dark and bright fringes in Young's experiment. Hence write the expression for the fringe width. (c) If s is the size of the source and its distance from the plane of the two slits, what should be the criterion for the interference fringes to be seen?

What is meant by coherent sources of light?

What is the difference between coherent and incoherent sources of light?

What are coherent sources? Green light of wavelength 5100 @A is incident on a double slit. IF the overall separation of 10 fingers on a screen 200 cm away from the slits is 2, find the distance between the slits.

What are coherent sources ? Define interfernece of light. Obtain the condition for constructive and destructive interference of light .

What are coherent sources ? Green light of wavelength 5100 Å is incident on a double slit. If the overall separation of 10 fringes on a screen 200 cm away from the slits is 2 cm find the distance between the slits.