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Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
Saurabh 1
Just use the simple relation for angle between two planes. Cosθ = 1×1+1×1+1×2 / √1+1+1 × √1+1+4 = 4/√18 Or cosθ = 4/3√2 = 0.942 ... So finally θ = arc cos(0.942) = 19.6° ... Ans.