以能力立意考查考生的学习潜能是高考选拔人才的必然要求。近几年的高考题中由内涵考外延的题层出不穷。这就需要我们在教学时能进一步揪住核心、抓住本质、拓展外延,起到“进一步而海阔天空”的效果。下面以近几年高考题中的光学题为例:2005年高考物理卷(江苏卷)中的第15题:18 It is an inevitable requirement for the selection of talents in the college entrance examination to examine the candidate’s learning potential. In recent years, the topics of examination and delineation in the college entrance examination questions are endless. This requires us to be able to further grasp the core, grasp the essence, and expand the extension when we are teaching, so as to achieve the effect of “further expanding the sky”. The following is an example of the optical problem in the college entrance examination questions in recent years: Item 15 in the 2005 Physical Examination Paper (Jiangsu Volume): 18