Two parallel plates are at temperature T1and T2 and have emissivities €1= 0.8 and € 2= 0.5. A radiation shield having the some emissivity E3on both sides is placed between the plates. Calculate the...

Two parallel plates are at temperature T1and T2 and have emissivities €1= 0.8 and € 2= 0.5. A radiation shield having the some emissivity E3on both sides is placed between the plates. Calculate the emissivity E3of the shield in order to reduce the radiation loss from the system to one tenth of that without the shield.