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A lens has a power of +2.5 D. What is the focal length of the lens in meters?
A lens has a power of +2.5 D. What is the focal length of the lens in meters?
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Practice Questions
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Q1
A lens has a power of +2.5 D. What is the focal length of the lens in meters?
0.4 m
0.5 m
0.6 m
0.7 m
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Power (P) = 1/f, so f = 1/P = 1/2.5 = 0.4 m.
Questions & Step-by-step Solutions
1 item
Q
Q: A lens has a power of +2.5 D. What is the focal length of the lens in meters?
Solution:
Power (P) = 1/f, so f = 1/P = 1/2.5 = 0.4 m.
Steps: 5
Show Steps
Step 1: Understand that the power of a lens (P) is related to its focal length (f) by the formula P = 1/f.
Step 2: Rearrange the formula to find the focal length: f = 1/P.
Step 3: Substitute the given power into the formula: f = 1/2.5.
Step 4: Calculate the value: 1 divided by 2.5 equals 0.4.
Step 5: Conclude that the focal length of the lens is 0.4 meters.
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