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A composite wall is made of two layers of thickness d1 and d2 having thermal conductive K and 2K and equal surface areas normal to the direction of heat flow. The outer surfaces of the composite wall are at 100°C and 200°C respectively. The heat transfer takes place only by conduction and the required surface temperature at the junction is 150° C. What will be the ratio of their thicknesses                             (IES-04)

d1 : d2?

a. 1 : 1                         b. 2 : 1

c. 1 : 2                         d. 2 : 3            

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