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Which of the following statements is true? |
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(a) |
A convex lens with power +4 D has a focal length – 0.25 m. |
(b) |
A convex lens with power –4 D has a focal length +0.25 m. |
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(c) |
A concave lens with power +4 D has a focal length – 0.25 m. |
(d) |
A concave lens with power –4 D has a focal length – 0.25 m. |
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Which of the following statements is true? |
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|
(a) |
A convex lens with power +4 D has a focal length – 0.25 m. |
(b) |
A convex lens with power –4 D has a focal length +0.25 m. |
|
(c) |
A concave lens with power +4 D has a focal length – 0.25 m. |
(d) |
A concave lens with power –4 D has a focal length – 0.25 m. |
A concave lens with power –4 D has a focal length – 0.25 m.