Is it necessary to have two waves of equal intensity to study interfrence pattern? Will there be an effect on clarity if the waves have unequal intensity?

Two waves of intensity I undergo interference. The maximum intensity obtained is

I_0 is the intensity of each of the two superposing waves. The intensity of the interference maxima is

It is found that what waves of same intensity from two coherent sources superpose at a certain point, then the resultant intensity is equal to the intensity of one wave only. This means that the phase difference between the two waves at that point is

It is found that what waves of same intensity from two coherent sources superpose at a certain point, then the resultant intensity is equal to the intensity of one wave only. This means that the phase difference between the two waves at that point is

To observe a stationary interference pattern formed by two light waves, it is not necessary that they must have

Draw intensity pattern of light in an interference of light waves.

Two waves having intensity ratio 25 : 4 produce interference. The ratio of maximum to minima intensity is