要把標本放大450倍,如果選用10X的目鏡,則物鏡應(yīng)選用( )
A.10X
B.40X
C.45X
D.60X
【答案】分析:顯微鏡放大倍數(shù)等于物鏡放大倍數(shù)與目鏡放大倍數(shù)的乘積.所以物鏡的放大倍數(shù)就應(yīng)是顯微鏡放大倍數(shù)除以目鏡的放大倍數(shù).
解答:解:通過分析已知要放大的倍數(shù)是600倍,目鏡放大倍數(shù)是10倍,而物鏡的放大倍數(shù)就應(yīng)是顯微鏡放大倍數(shù)除以目鏡的放大倍數(shù),即450÷10═45(倍).
故選C.
點評:只要牢記顯微鏡放大倍數(shù)等于物鏡放大倍數(shù)與目鏡放大倍數(shù)的乘積,這類題目就會迎刃而解.