如图所示,两列波长为λ的相干波在点P相遇.波在点<img src="https://tihai-oss-cloud.itihey.com/img/e4dd70bdfc5f939ecf5172f85e8e63a6.webp">振动的初相位是<img src="https://tihai-oss-cloud.itihey.com/img/3006a369ba64f103edd43660ad60252d.webp">,点<img src="https://tihai-oss-cloud.itihey.com/img/e4dd70bdfc5f939ecf5172f85e8e63a6.webp">到P点的距离是<img src="https://tihai-oss-cloud.itihey.com/img/e8b542b8b609cdbf80ba0e37c974c6e9.webp">.波在点<img src="https://tihai-oss-cloud.itihey.com/img/28306925e0f3f435d9d7b69450c301a9.webp">的初相位是<img src="https://tihai-oss-cloud.itihey.com/img/7c0e7b171d404e4d2edad2b9a0d66d83.webp">,点<img src="https://tihai-oss-cloud.itihey.com/img/28306925e0f3f435d9d7b69450c301a9.webp">到点P的距离是<img src="https://tihai-oss-cloud.itihey.com/img/271841477c7ed138e0a2c4a5c1e9d6de.webp">.以k代表零或正、负整数,则点P的干涉极大的条件为()(单选题)