Which statement about a concave lens in air is correct?
Options
- A. It has positive focal length
- B. It has negative focal length
- C. It always has zero focal length
- D. It has infinite positive power
- E. None of the above
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Correct Answer (Detailed Explanation is Below)
B. It has negative focal length
Detailed Explanation
A concave lens is a diverging lens and has a negative focal length when using the standard Cartesian sign convention.
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