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The angle of elevation of the top of a v...

The angle of elevation of the top of a vertical tower from two points distance a and b from the base and in the same line with it, are complimentary .If `theta` is the angle subtended at the top of the tower by the line joining these points then sin `theta` =

A

`(a-b)/(sqrt2(a+b))`

B

`(a+b)/(a-b)`

C

`(a-b)/(a+b)`

D

none of these

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The correct Answer is:
C
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OBJECTIVE RD SHARMA-HEIGHTS AND DISTANCES-Exercise
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  5. A person standing on the bank of a river finds that the angle of elev...

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  6. A tower subtends an angle of 30^@ at a point on the same level as the ...

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  7. AB is a vertical pole and C is its mid point. The end A is on the leve...

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  8. The angle of depression of a point situated at a distance of 70 metres...

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  13. A tower 50 m high , stands on top of a mount, from a point on the grou...

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  14. A person on a ship sailing north sees two lighthouses which are 6 km a...

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  15. An observer finds that the elevation of the top of a tower is 22.5^@ a...

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  16. A vertical lamp-post, 6m high, stands at a distance of 2 m from a wall...

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  17. The angle of elevation of the top of a vertical pole when observed ...

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  18. The upper (3/4)^(th) portion of a vertical pole subtends an angle "tan...

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  19. A person standing on the bank of a river observes that the angle of el...

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  20. A tower subtends angles alpha,2alpha,3alpha respectively, at point A ,...

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