A.33.7° B.56.3° C.41.8° D.48.2°
A.41.5° B.48.5° C.36.9° D.53.1°
A.光線從光密媒質(zhì)向光疏媒質(zhì)入射,i≥ic B.光線從光疏媒質(zhì)向光密媒質(zhì)入射,i≥ic C.光線從光密媒質(zhì)向光疏媒質(zhì)入射,i≤ic D.光線從光疏媒質(zhì)向光密媒質(zhì)入射,i≤ic