A convex lens has a focal length of \( 0.5 \mathrm{~m} \). It is combined with a second lens, so...

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A convex lens has a focal length of \( 0.5 \mathrm{~m} \). It is combined with a second lens, so that the combination has a power of 1.5 diopter. Then the second lens is
a. A concave lens of focal length \( 2 \mathrm{~m} \).
b. A convex lens of focal length \( 0.5 \mathrm{~m} \).
c. A concave lens of focal length \( 0.5 \mathrm{~m} \).
d. A convex lens of focal length \( 2 \mathrm{~m} \).
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