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Question

If $ \vec{a} = \hat{i} + \lambda \hat{j} + 2\hat{k} $, $ \vec{b} = \mu \hat{i} + \hat{j} - \hat{k} $ are orthogonal and $ |\vec{a}| = |\vec{b}| $, then $ (\lambda, \mu) = $

$ \left(\frac{1}{4}, \frac{7}{4}\right) $

$ \left(\frac{7}{4}, \frac{1}{4}\right) $

$ \left(\frac{1}{4}, \frac{9}{4}\right) $

$ \left(-\frac{1}{4}, \frac{9}{4}\right) $

Solution

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