If the angle of elevation of the sun changes from $45^{0}$ to $60^{0}$,then the length of the shadow of a pillar decreases by 10 m. The height of the pillar is :

If the angle of elevation of the sun changes from $45^{0}$ to $60^{0}$,then the length of the shadow of a pillar decreases by 10 m. The height of the pillar is :
1). $5(3 -\sqrt{3})$ metre
2). $5(\sqrt{3}+1)$ metre
3). $15(\sqrt{3}+1)$ metre
4). $5(3 +\sqrt{3})$ metre

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