Questions
BN5102 系列 测验 2
Single choice
The power of a lens is 40D, which of the following is the shortest possible object distance to form a real image?
Options
A.2.0 cm
B.3.0 cm
C.4.0 cm
D.5.0 cm
View Explanation
Verified Answer
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Step-by-Step Analysis
The lens power is given as 40 diopters, which means the focal length f is f = 1/P = 1/40 m = 0.025 m = 2.5 cm.
For a converging lens, a real image is formed only when the object di......Login to view full explanationLog in for full answers
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