题目
BN5102 Quiz 2
多项填空题
The following figure illustrate the optical design of a fundus camera. The objective lens L1, in combination with the eye lens, forms a real image of the retina in the intermediate plane P1. The corresponding magnification is 2. The focal lengths for lens L2 and L3 are 40 mm and 10 mm, respectively. A CCD camera is used to capture images formed in plane P2. a. The focal length of L1 should be [Fill in the blank], mm. b. The magnification of the lens system L2/L3 is [Fill in the blank], . c. The magnification of the funds camera is [Fill in the blank], . Round your answer to two significant figures.
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标准答案
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思路分析
We are given a schematic of a fundus camera with three lenses L1, L2, and L3, and three quantities to fill:
a. The focal length of L1 should be [Fill in the blank] mm.
b. The magnification of the lens system L2/L3 is [Fill in the blank].
c. The magnification of the fundus camera is [Fill in the blank].
First, parse what the problem states: L1 together with the eye lens forms a real image of the retina in an intermediate plane P1, and the magnification for this stage (retina to P1) is 2. The focal lengths given are f2 = 40 mm for L2 and f3 = 10 mm for L3. A CCD camera captures images formed in plane P2, presumably after the L2/L3 relay.
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