Question

如图所示太阳光线与水平面成60°角,若用平面镜将太阳光反射到井底,镜面应与水面成多大角度放置,画图说明

Answer 1

∠ AOB=60°

∠ BOC=90°

∠ AOC=60°+90°=150°

∠AOD=∠EOC=0.5(180°-150°)=15°

∠B0D=75°