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If a lens has a power of -2 D, what is its focal length?
If a lens has a power of -2 D, what is its focal length?
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Practice Questions
1 question
Q1
If a lens has a power of -2 D, what is its focal length?
-50 cm
-25 cm
25 cm
50 cm
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Power (P) = 1/f, so f = 1/P = 1/(-2) = -0.5 m = -50 cm.
Questions & Step-by-step Solutions
1 item
Q
Q: If a lens has a power of -2 D, what is its focal length?
Solution:
Power (P) = 1/f, so f = 1/P = 1/(-2) = -0.5 m = -50 cm.
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).
Step 4: Calculate the focal length: f = -0.5 m.
Step 5: Convert the focal length from meters to centimeters: -0.5 m = -50 cm.
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