A) 3.2 m
B) 20.8 m
C) 91.5 m
D) 183 m
Correct Answer: A
Solution :
As limit of resolution of eye is \[{{\left( \frac{1}{60} \right)}^{o}}\], the pillars will be seen distinctly if \[\theta >{{\left( \frac{1}{60} \right)}^{o}}\] i.e., \[\frac{d}{x}>\left( \frac{1}{60} \right)\times \frac{\pi }{180}\] \[\Rightarrow d>\frac{\pi \times x}{60\times 180}\] \[\Rightarrow d>\frac{3.14\times 11\times {{10}^{3}}}{60\times 180}\]\[\Rightarrow d>3.2\ m\]You need to login to perform this action.
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