The focal lengths of the objective and of the eye-piece of a compound microscope are and respectively. If is the tube length and D, the least distance of distinct vision, then its angular magnification, when the image is formed at infinity, is |
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a) |
b) |
c) |
d) |

The focal lengths of the objective and of the eye-piece of a compound microscope are and respectively. If is the tube length and D, the least distance of distinct vision, then its angular magnification, when the image is formed at infinity, is |
|||||||

a) |
b) |
c) |
d) |

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