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A slab consists of two parallel layers of two different materials of same thickness having thermal conductivities \( K_{1} \)
\( \mathrm{P} \) and \( K_{2} \). The equivalent conductivity of the combination is

W
[BHU 2001; MP PET 2007]
(a) \( K_{1}+K_{2} \)
(b) \( \frac{K_{1}+K_{2}}{2} \)
(c) \( \frac{2 K_{1} K_{2}}{K_{1}+K_{2}} \)
(d) \( \frac{K_{1}+K_{2}}{2 K_{1} K_{2}} \)
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