Question

顯微鏡放大倍數(shù)的計數(shù)方法是（　�。�

A．以物鏡倍數(shù)為準

B．以目鏡倍教為準

C．目鏡與物鏡倍數(shù)之和

D．目鏡與物鏡倍數(shù)的乘積

Answer 1

分析：顯微鏡成像的特點是倒立放大的像．顯微鏡的放大倍數(shù)=目鏡倍數(shù)×物鏡倍數(shù)．

解答：解：普通的光學顯微鏡是根據(jù)凸透鏡的成像原理形成的，要經(jīng)過凸透鏡的兩次（物鏡、目鏡）成像，成的像是放大的倒立的實像．顯微鏡的放大倍數(shù)就是目鏡的放大倍數(shù)和物鏡的放大倍數(shù)的乘積，乘積越大放大倍數(shù)越大，乘積小放大倍數(shù)就小．
故選D

點評：顯微鏡的放大倍數(shù)等于目鏡的放大倍數(shù)與物鏡的放大倍數(shù)的乘積．