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If a concave lens has a focal length of -15 cm, what is its power?
If a concave lens has a focal length of -15 cm, what is its power?
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Practice Questions
1 question
Q1
If a concave lens has a focal length of -15 cm, what is its power?
-6.67 D
6.67 D
-15 D
15 D
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Power (P) = 1/f = 1/(-0.15) = -6.67 D.
Questions & Step-by-step Solutions
1 item
Q
Q: If a concave lens has a focal length of -15 cm, what is its power?
Solution:
Power (P) = 1/f = 1/(-0.15) = -6.67 D.
Steps: 5
Show Steps
Step 1: Understand that the focal length (f) of the lens is given as -15 cm. The negative sign indicates that it is a concave lens.
Step 2: Convert the focal length from centimeters to meters. Since 1 cm = 0.01 m, -15 cm = -0.15 m.
Step 3: Use the formula for power (P) of a lens, which is P = 1/f, where f is the focal length in meters.
Step 4: Substitute the focal length into the formula: P = 1/(-0.15).
Step 5: Calculate the power: P = -6.67 D (diopters). The negative sign indicates that it is a concave lens.
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