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If L₁ and L₂ are actual and theoretical lengths of a tongue rail, d is heel divergence and t is thickness of tongue rail at toe, the switch angle Î± is

$sin^-1 \frac { d-t } { L1 }$

$tan^-1 \frac { d-t } { L1 }$

$sin^-1 \frac { d-t } { L2 }$

$tan^-1 \frac { d-t } { L2 }$

$cot^-1 \frac { d-t } { L2 }$

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Answer : Option A

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