题目1单选题
在棱镜眼镜中,球镜的水平棱镜度 <img src="https://tihai-oss-cloud.itihey.com/img/7f69e6a2491295154f4bf0d9c83d1421.png"> 与移心量 <img src="https://tihai-oss-cloud.itihey.com/img/2b72f413e78108802f7f45bd80717a9c.png"> 的关系式为 <img src="https://tihai-oss-cloud.itihey.com/img/ac7770eac87f233cc62261d0ec436547.png">.若 <img src="https://tihai-oss-cloud.itihey.com/img/a8d464379fa44e28a2abe0231c982e69.png">,<img src="https://tihai-oss-cloud.itihey.com/img/f662d99bdd3dbe8d8a66f45943c14ecc.png">,则移心量 <img src="https://tihai-oss-cloud.itihey.com/img/2b72f413e78108802f7f45bd80717a9c.png"> 的值及方向为A. <img src="https://tihai-oss-cloud.itihey.com/img/a8f0ccff1dd36650e81dce5cbec6cb21.png">,方向向外B. <img src="https://tihai-oss-cloud.itihey.com/img/a8f0ccff1dd36650e81dce5cbec6cb21.png">,方向向内C. <img src="https://tihai-oss-cloud.itihey.com/img/f0413db41a82793a5ae5d8cc98d6e602.png">,方向向内D. <img src="https://tihai-oss-cloud.itihey.com/img/f0413db41a82793a5ae5d8cc98d6e602.png">,方向向外