作业帮who can do it16.直线AB是光滑木板与棉布的分界线（木板与棉布处在同一水平面上）,然后使一个小线轴（如缝纫机上的线轴）沿着与直线AB成一角度的方向PO匀速滚动,可以看到,线轴在棉布上滚动
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who can do it16.直线AB是光滑木板与棉布的分界线（木板与棉布处在同一水平面上）,然后使一个小线轴（如缝纫机上的线轴）沿着与直线AB成一角度的方向PO匀速滚动,可以看到,线轴在棉布上滚动
who can do it
16.直线AB是光滑木板与棉布的分界线（木板与棉布处在同一水平面上）,然后使一个小线轴（如缝纫机上的线轴）沿着与直线AB成一角度的方向PO匀速滚动,可以看到,线轴在棉布上滚动的方向发生了改变.所示,一束光从空气斜射入玻璃中时传播方向也发生了改变.
（1）可知当线轴的甲轮刚接触到棉布时,其速度的大小将 （变小/ 不变/变大）,此时乙轮速度的大小将 （变小/不变 /变大）
（2）两种类似现象可知,光由空气斜射入玻璃时而发生折射现象的原因可能是 .
who can do it16.直线AB是光滑木板与棉布的分界线（木板与棉布处在同一水平面上）,然后使一个小线轴（如缝纫机上的线轴）沿着与直线AB成一角度的方向PO匀速滚动,可以看到,线轴在棉布上滚动
1、甲轮速度变小,乙轮速度不变.
2、光折射的原因可能是,玻璃对光传播的阻力比空气大.
who can do it16.直线AB是光滑木板与棉布的分界线（木板与棉布处在同一水平面上）,然后使一个小线轴（如缝纫机上的线轴）沿着与直线AB成一角度的方向PO匀速滚动,可以看到,线轴在棉布上滚动
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