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Light passes successively through two polarimeters tubes each of length \( 0.29 \mathrm{~m} \). The first tube contains dextro rotatory solution of concentration \( 60 \mathrm{kgm}^{-3} \) and specific rotation \( 0.01 \mathrm{rad} \mathrm{m}^{2} \mathrm{~kg}^{-1} \). The second tube contains laevo rotatory solution of concentration \( 30 \mathrm{~kg} / \mathrm{m}^{3} \) and specific rotation \( 0.02 \mathrm{rad} \mathrm{m}^{2} \mathrm{~kg}^{-1} \). The net rotation produced is
(A) \( 15^{\circ} \)
(B) \( 20^{\circ} \)
(C) \( 0^{\circ} \)
(D) \( 10^{\circ} \)
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