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Two parallel pillars are 11 km away from...

Two parallel pillars are `11 km` away from an observer. The minimum distance between the pillars so that they can be seen separately will be

A

3 . 2 m

B

20 . 8 m

C

91 . 5 m

D

183 m

Text Solution

Verified by Experts

The correct Answer is:
A
As limit of resolution of eye is `((1)/(60))^(@)`, the pillars will be seen distinctly if `thetagt((1)/(60))^(@)`
`i.e.,(d)/(x)gt((1)/(60))xx(pi)/(180)`
`rArrd gt(pixxx)/(60xx180)`

`rArr d gt(3.14xx11xx10^(3))/(60xx180)`
`rArrd gt 3.2 m `
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