Define coherent sources.

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

Why is interference pattern not detected when two coherent sources are far apart?

In Young's double slit experiment the coherent sources are 1.5 mm apart and the fringes are obtained on a screen at a distance 2.5 m from the plane of the sources. If the sources is illuminated with a light of 589.3 nm wavelength , find the number of fringes in the interference pattern thus formed on the screen. Total length of the fringes are 4.9 xx 10 ^(-3) m.

In Young's doubIe sIit experiment, seperation between two coherent sources is 0.90 mm and fringes are formed at adistance I m from the sIits . If the second dark fringe is formed at a distance I mm from the centraI band , then detemine the waveIength of the monochromatic Iight used.

What is the importance of coherent sources in case of interference of light ? How are coherent sources produced ?

What among the following remains same in case.of thevvaves coming,put from coherent sources?

The ratio of the intensities of two coherent sources is 25:16. After interference what will b the ratio of maximum an minimum intesities?

Ratio of the amplitudes of two waves emitted from a pair of coherent sources is 2:1. If the two waves superpose, what will be the ratio of maximum and minimum intensities? What would have been the intensity at different points on screen if the sources were not coherent?

If the ratio of maximum and minimum intensities of the interference fringes obtained in Young's double slit experiment is 4: 1 then the ratio of the amplitudes of the two coherent sources will be

Statement I: Interference pattern is obtained on a screen due to two identical coherent sources of monochromatic light. The intensity at the central part of the screen becomes one -fourth if one of the sources is blocked. Statement II: The resultant intensity is the sum of the intensities due to two sources.