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The values of $λ$ for which the matrix $A = (\begin{array}{ccc} λ & 0 & λ \\ λ & 0 & - λ \\ 0 & 1 & 0 \end{array})$ is orthogonal is

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Correct option is D

AA′=I⇒λ0λλ0−λ010λλ0001λ−λ0=100010001⇒2λ20002λ20001=100010001∴2λ2=1⇒λ=±1/2

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The values ofλ for which the matrix A=λ0λλ0−λ010 is orthogonal is

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The values of $λ$ for which the matrix $A = (\begin{array}{ccc} λ & 0 & λ \\ λ & 0 & - λ \\ 0 & 1 & 0 \end{array})$ is orthogonal is