A.平面鏡不改變光束性質(zhì)，會(huì)聚光束經(jīng)它反射后仍為會(huì)聚光束，發(fā)散光束經(jīng)它反射后仍為發(fā)散光束
B.凸透鏡是會(huì)聚透鏡，任何光束經(jīng)凸透鏡折射后必為會(huì)聚光束
C.凹透鏡是發(fā)散透鏡，任何光束經(jīng)凹透鏡折射后必為發(fā)散光束
D.棱鏡對(duì)白光有色散作用，平行光束經(jīng)棱鏡折射后必為發(fā)散光束

A.只有把透鏡放在光疏介質(zhì)（與透鏡材料比較）中，凸透鏡對(duì)光線才有會(huì)聚作用
B.凸透鏡對(duì)光線有會(huì)聚作用，任何光束經(jīng)它會(huì)聚后必為會(huì)聚光束
C.透鏡對(duì)白光有色散作用，同一透鏡對(duì)紅光焦距最長
D.透鏡焦距越長，說明透鏡對(duì)光線的會(huì)聚與發(fā)散作用越差