A particle is projected with a certain velocity at an angle \( \alpha \) above the horizontal fr...

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A particle is projected with a certain velocity at an angle \( \alpha \) above the horizontal from the foot of an inclined plane of
\( \mathrm{P} \) inclination \( 30^{\circ} \). If the particle strikes the plane normally,

W. then \( \alpha \) is equal to
(1) \( 30^{\circ}+\tan ^{-1}\left(\frac{\sqrt{3}}{2}\right) \)
(2) \( 45^{\circ} \)
(3) \( 60^{\circ} \)
(4) \( 30^{\circ}+\tan ^{-1}(2 \sqrt{3}) \)
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