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The length of the shadow of a tower on the plane ground is $\sqrt{3}$ times the height of the tower. The angle of elevation of the Sun is :
- (a)$30^{\circ}$
- (b)$60^{\circ}$
- (c)$45^{\circ}$
- (d)$90^{\circ}$
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(A) $30^{\circ}$