Question

A person wants to see two pillars from a distance of 11 km, separately. The distance between the pillars must be approximately

• A. 3.2m
• B. 1m
• C. 0.25 m
• D. 0.5 m

Answer 1

The correct option is A 3.2m

Resolving power of eye = $1^{\prime }=\frac{\pi }{60\times 180}radians$ (approximately)

Let the separation between pillars $=xm$

Distance $=11000m$

=> $\frac{x}{11000}=\frac{\pi }{60\times 180}$

=> $x=3.2m$ (approximately)

Answer. A)$3.2m$