观察洋葱鳞片叶表皮细胞装片时,第一次使用的物镜是 4×、目镜是 10×,第二次观察时改用物镜 40×、目镜
\u89c2\u5bdf\u6d0b\u8471\u9cde\u7247\u53f6\u8868\u76ae\u7ec6\u80de\u88c5\u7247\u65f6\uff0c\u7b2c\u4e00\u6b21\u4f7f\u7528\u7684\u7269\u955c\u662f 4\u00d7\u3001\u76ee\u955c\u662f 10\u00d7\uff0c\u7b2c\u4e8c\u6b21\u89c2\u5bdf\u65f6\u6539\u7528\u7269\u955c 40\u00d7\u3001\u76ee\u955c\u5728\u663e\u5fae\u955c\u4e0b\u770b\u5230\u7684\u7269\u50cf\u653e\u5927\u7684\u500d\u6570\u4e3a\u76ee\u955c\u7684\u653e\u5927\u500d\u6570\u4e58\u4ee5\u7269\u955c\u7684\u653e\u5927\u500d\u6570\u7684\u79ef\u5373\u7269\u50cf\u653e\u5927\u500d\u6570=\u7269\u955c\u500d\u6570\u00d7\u76ee\u955c\u500d\u6570\uff0e\u663e\u5fae\u955c\u7684\u653e\u5927\u500d\u6570\u589e\u52a0\uff0c\u89c6\u91ce\u4e2d\u7ec6\u80de\u7684\u4f53\u79ef\u53d8\u5927\uff0c\u7ec6\u80de\u7684\u6570\u76ee\u51cf\u5c11\uff1b\u663e\u5fae\u955c\u7684\u653e\u5927\u500d\u6570\u51cf\u5c0f\uff0c\u89c6\u91ce\u4e2d\u7ec6\u80de\u7684\u4f53\u79ef\u53d8\u5c0f\uff0c\u7ec6\u80de\u7684\u6570\u76ee\u589e\u591a\uff0e\u4f9d\u9898\u610f\uff0c\u7b2c\u4e00\u6b21\u7269\u50cf\u653e\u5927\u500d\u6570=\u7269\u955c\u500d\u6570\u00d7\u76ee\u955c\u500d\u6570=4\u00d710=40\uff0c\u7b2c\u4e8c\u6b21\u7269\u50cf\u653e\u5927\u500d\u6570=40\u00d715=600.600\u00f740\u255015\u500d\u6545\u9009\uff1aA
\u663e\u5fae\u955c\u7684\u653e\u5927\u500d\u6570\u2550\u7269\u955c\u653e\u5927\u500d\u6570\u00d7\u76ee\u955c\u653e\u5927\u500d\u6570\uff0e\u7b2c\u4e00\u6b21\u663e\u5fae\u955c\u7684\u653e\u5927\u500d\u6570\u4e3a\uff1a5\u00d710\u255050\u500d\uff0c\u7b2c\u4e8c\u6b21\u663e\u5fae\u955c\u7684\u653e\u5927\u500d\u6570\u4e3a\uff1a10\u00d745\u2550450\u500d\uff0c\u5728\u4f7f\u7528\u4e2d\u7531\u4f4e\u500d\u955c\u6362\u6210\u9ad8\u500d\u955c\u540e\uff0c\u663e\u5fae\u955c\u7684\u653e\u5927\u500d\u6570\u589e\u52a0\uff0c\u89c6\u91ce\u4e2d\u7ec6\u80de\u7684\u4f53\u79ef\u53d8\u5927\uff0c\u7ec6\u80de\u7684\u6570\u76ee\u51cf\u5c11\uff0c\u89c6\u91ce\u53d8\u6697\uff0e\u6545\u9009\uff1aD
在显微镜下看到的物像放大的倍数为目镜的放大倍数乘以物镜的放大倍数的积即物像放大倍数=物镜倍数×目镜倍数.显微镜的放大倍数增加,视野中细胞的体积变大,细胞的数目减少;显微镜的放大倍数减小,视野中细胞的体积变小,细胞的数目增多.依题意,第一次物像放大倍数=物镜倍数×目镜倍数=4×10=40,第二次物像放大倍数=40×15=600.600÷40═15倍故选:A
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