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A man standing on a level plane observes...

A man standing on a level plane observes the anlge of elevation of top of pole to be '`alpha`'. He walks a distance equal to double the height of pole towards it and finds that the elevation in `2 alpha " then " alpha` =

A

`pi/12`

B

`pi/4`

C

`pi/6`

D

`pi/3`

Text Solution

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The correct Answer is:
A
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Knowledge Check

  • A man standing on a level plane oberves the angle of elevation of top of pole to be alpha . He walks a distance equal to double the height of pole towards it and finds that the elevation is 2alpha then alpha=

    A
    `(pi)/(12)`
    B
    `(pi)/(4)`
    C
    `(pi)/(6)`
    D
    `(pi)/(3)`

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    20 m
    B
    60 m
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    30 m

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    A
    `10( sqrt3-1)`
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    C
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