The angle of elevation of the sun, when the length of the shadow of a tree √3 times the height of the tree, is:

Answer: Option A

Let AB be the tree and AC be its shadow.

Let ∠ACB = θ
$$\frac{AC}{AB}=\cot \theta$$
$$\frac{AC}{AB}=\sqrt{3}$$
$$\cot 30^{\circ }=\sqrt{3}$$
∴ θ = 30°