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A lens has a power of +5 diopters. What is its focal length?
A lens has a power of +5 diopters. What is its focal length?
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Practice Questions
1 question
Q1
A lens has a power of +5 diopters. What is its focal length?
20 cm
25 cm
30 cm
15 cm
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Power (P) = 1/f (in meters). Therefore, f = 1/P = 1/5 = 0.2 m = 20 cm.
Questions & Step-by-step Solutions
1 item
Q
Q: A lens has a power of +5 diopters. What is its focal length?
Solution:
Power (P) = 1/f (in meters). Therefore, f = 1/P = 1/5 = 0.2 m = 20 cm.
Steps: 6
Show Steps
Step 1: Understand that the power of a lens (P) is related to its focal length (f).
Step 2: Remember the formula that connects power and focal length: P = 1/f.
Step 3: Rearrange the formula to find the focal length: f = 1/P.
Step 4: Substitute the given power into the formula: f = 1/5.
Step 5: Calculate the focal length: f = 0.2 meters.
Step 6: Convert meters to centimeters if needed: 0.2 meters = 20 centimeters.
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