IIT JEE 1983 Maths - MCQ Question 13

Geometry Level 3

From the top of a light-house 60 m high with its base at the sea level, the angle of depression of the boat is 1 5 ∘ 15^\circ . The distance of the boat from the foot of the light-house is __________ . \text{\_\_\_\_\_\_\_\_\_\_} .

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( 3 + 1 3 − 1 ) 2 \big(\frac{\sqrt3+1}{\sqrt3-1}\big)^2 m None of the others ( 3 − 1 3 + 1 ) 60 \big(\frac{\sqrt3-1}{\sqrt3+1}\big)60 m ( 3 + 1 3 − 1 ) 60 \big(\frac{\sqrt3+1}{\sqrt3-1}\big)60 m

Shubhamkar Ayare by Shubhamkar Ayare , 22, India

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