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What is the focal length of a concave lens with a power of -2 diopters?
What is the focal length of a concave lens with a power of -2 diopters?
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Practice Questions
1 question
Q1
What is the focal length of a concave lens with a power of -2 diopters?
-0.5 m
0.5 m
-2 m
2 m
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Power (P) = 1/focal length (f). Therefore, f = 1/P = 1/(-2) = -0.5 m.
Questions & Step-by-step Solutions
1 item
Q
Q: What is the focal length of a concave lens with a power of -2 diopters?
Solution:
Power (P) = 1/focal length (f). Therefore, f = 1/P = 1/(-2) = -0.5 m.
Steps: 5
Show Steps
Step 1: Understand that the power of a lens is related to its focal length. The formula is Power (P) = 1/focal length (f).
Step 2: Identify the power of the lens given in the question, which is -2 diopters.
Step 3: Use the formula to find the focal length. Rearrange the formula to solve for focal length: f = 1/P.
Step 4: Substitute the power into the formula: f = 1/(-2).
Step 5: Calculate the focal length: f = -0.5 meters.
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