用显微镜观察人的口腔上皮细胞装片,请据下表回答问题: 组别 目镜 物镜 A组 5× 10×
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A的放大倍数:5×10═50倍,B的放大倍数:15×10═150倍,C的放大倍数:8×40═320倍,故C放大倍数最大;可见,C的放大倍数最大,看到的细胞数目最少;A的放大倍数最小,光线最亮,细胞体积最小. 调节光线强弱的结构是反光镜和遮光器,若视野中光线较暗,应选用大光圈和凹面镜,显微镜下物象模糊不清,这时可先转动细准焦螺旋,直到看到较为清晰的物像; 在显微镜中成的像是倒像的,如果发现物像位于视野的右下方,它实际上位于玻片标本的左上方,所以要移到中央,应向右下方移动.我们可以这样记忆:物像位于视野的哪个方向,就向哪个方向移动,就能移到视野的中央. 视野中能看到污点的位置只有目镜、物镜、与玻片标本,在实验中转动目镜,污点不动,转动转换器,调换物镜,污点还不动;说明污点可能在玻片标本上.故答案为:C;A;A;反光镜;遮光器;细准焦螺旋;右下方;目镜;凹面.
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