JEE Advance - Mathematics (1983 - No. 49)
From the top of a light-house 60 metres high with its base at the sea-level, the angle of depression of a boat is $${15^ \circ }$$. The distance of the boat from the foot of the light house is
$$\left( {{{\sqrt 3 - 1} \over {\sqrt 3 + 1}}} \right)60$$ metres
$$\left( {{{\sqrt 3 + 1} \over {\sqrt 3 - 1}}} \right)60$$ metres
$${\left( {{{\sqrt 3 + 1} \over {\sqrt 3 - 1}}} \right)^2}$$ metres
none of these