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Why is interference pattern not detected...

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

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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.

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

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.

The ratio of intensities of two coherent sources is beta . An interference fringe pattern is produced due to their superposition. Find the magnitude of (I_("max")-I_("min"))//(I_("max")+I_("min")) .

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

Light waves of different intensities from two coherent sources superpose to interfere. If ration of the maximum intensity to minimum intensity is 25, find the ratio fo the intensities of the sources.

Draw the intensity pattern for single slit diffraction and double slit interference. Hence, state two differences between interference and diffraction patterns.

In interference pattern by two identical slits the intensity of central maximum is I. what will be the intensity at the same spot if one of the slits is closed?

Mixture of lights consiosting of wavelengths 590 nm and an unknown wavelength illuminates young' s double slit and gives rise to two overlapping interference patterns on the screen . The central maximum of both lights coincide. Further, it is observed that the third brright fringe of 590 m light conincides with the fourth bright fringe of the other light. From this data, calculate the unknown wave length.