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$L_{1}$ and $L_{2}$ are two intersecting lines. If the image of $L_{1}$ w. r. t $L_{2}$ and that of $L_{2}$ w. r. t $L_{1}$ coincide, then the angle between $L_{1}$ and $L_{2}$ is-----------(in degrees)

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answer is 60.

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Detailed Solution

$L_{1}^{'}$ is image 0f $L_{1}$ w. r. t to $L_{2}$ and
$L_{2}^{'}$ is image of $L_{2}$ w. r. t to $L_{1}$
If $L_{1}^{'}$ and $L_{2}^{'}$ are coinciding, then angle between them i.e; $3 θ = 180$

$θ = 60$

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