In the figure below, P and Q are two equally intense coherent sources emitting radiation of wavelength 20 m. The separation between P and Q is 5 m and the phase of P is ahead of that of Q by 90°. A, B and C are three distinct points of observation, each equidistant from the midpoint of PQ. The intensities of radiation at A, B, C will be in the ratio
![](https://sahay.guru/wp-content/uploads/2021/09/Solution-3A-5-858x1024.jpg)
![](https://sahay.guru/wp-content/uploads/2021/09/Solution-3B-5-533x1024.jpg)