Two sources of light are said to be coherent when both give out light waves of same:

Q. Waves from two sources superpose on each other at a particular point, amplitude and frequency of both the waves are equal. The ratio of intensities when both waves reach in the same phase and when they reach with the phase difference of ${90}^{\circ }$ will be

Q. Waves from two different sources overlap near a particular point. The amplitude and the frequency of the two waves are same. The ratio of the intensity when the two waves arrive in phase to that when they arrive ${90}^o$ out phase is:

Q. Assertion :For two source to be coherent phase difference between two waves at all points should be same. Reason: Two different light source are never coherent.

Q. Assertion :Only coherent light sources produce sustained interference. Reason: Coherent light sources emit lights of same wavelength and with a constant phase difference.

Q. Two sources of light are said to be coherent, when they give light waves of same