问题 选择题

一束光跟平面镜之间的夹角是40°,则(  )

A.入射角为40°

B.反射角为50°

C.反射角为40°

D.反射光线和入射光线的夹角为80°

答案

光线与平面镜成40°角射向平面镜,则入射角=90°-40°=50°,反射角也是50°,反射光线与入射光线的夹角等于入射角和反射角的和,即夹角为50°+50°=100°.

故选B.

完形填空
完形填空。
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选择题