题目

两束光线通过凸透镜后A. 一定相交于一点B. 一定会聚于焦点C. 一定靠拢但不一定相交D. 一定发散 答案：【答案】C【解析】题目中对这束入射光没有说明其特点，所以入射光不能确定：若入射光线过凸透镜的焦点，则折射光线是平行光；若入射光线是平行光或是会聚的光线，经过凸透镜折射后，一定会形成会聚光束；若是发散程度较小的入射光线经过凸透镜折射后也有可能形成会聚光束；若入射光线是发Sunny English Club 1.Sunny English Club is for ______ . A. nurses        B. policemen       C. businessmen     D. students 2.You will pay _______ if you want to stay in the English club for half a year. A. 300 yuan      B. 600 yuan        C. 1200 yuan      D. 2400 yuan 3. You can visit Ocean Museum _______ .   A. on Saturday     B. on Wednesday    C. on Monday     D. anytime 4.If you are interested in the life of fish, you should go to ______ .   A. Health Centre    B. Ocean Museum  C. Sunny English Club   D. 16 Yong Le Street