What are coherent sources? How are they realized in practice?

Two coherent sources must have the same

A pair of coherent sources may be

What is meant by coherent sources of light?

A : When the coherent sources are far apart, interference pattern cannot be detected. R : If two point coherent sources are infinitely close to each other, firinges appears very sharp.

Why coherent sources are required to create interference of light ? Explain how Fresnel biprism is used to obtain two coherent sources of light.

Two coherent source of light can be obtained by

In Young’s experiment, the ratio of maximum to minimum intensities of the fringe system is 4 : 1 . The amplitudes of the coherent sources are in the ratio

A : Light from two coherent sources is reaching the screen. If the path difference at a point on the screen for yellow light is 3lambda"/"2 , then the fringe at the point will be coloured. R : Two coherent sources always have same phase relationship at any point on the screen.

Light from two coherent sources of the same amplitude A and wavelength lambda illuminates the screen. The intensity of the central maximum is I_(0) . If the sources were incoherent, the intensity at the same point will be

For a particle in motion which of the following speed-time graphs can be realized in practice :