Which of the following statements is/are true? a. A concave lens has 4 dioptre power having a fo...

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Which of the following statements is/are true?
a. A concave lens has 4 dioptre power having a focal length \( 0.25 \mathrm{~m} \)
b. A convex lens has -4 dioptre power having a focal length \( 0.25 \mathrm{~m} \)
c. A convex lens has 4 dioptre power having a focal length \( 0.25 \mathrm{~m} \)
d. A concave lens has -4 dioptre having a focal \( 0.25 \mathrm{~m} \)
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