A person lives in a high-rise building on the bank of a river 50 m wide. Across the river is a well-lit tower of height 40 m. When the person, who is at a height of 10 m, looks through a polarizer at an appropriate angle at light of the tower reflecting from the river surface, he notes that intensity of light coming from distance X from his building is the least and this corresponds to the light coming from light bulbs at height Y on the tower. The values of X and Y are respectively close to (refractive index of water\[\simeq \frac{4}{3}\]) [JEE ONLINE 09-04-2013] |
A) 25 m, 10 m
B) 13 m, 27 m
C) 22 m, 13 m
D) 17 m, 20 m
Correct Answer: B
Solution :
[b] |
It is the case of Booster angle where reflected and refracted ray both become polarized. |
So, |
From triangle ABC, |
From triangle AEF, |
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