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The angle of elevation of a cloud from a...

The angle of elevation of a cloud from a point h mt. above is `theta^@` and the angle of depression of its reflection in the lake is `phi`. Then, the height is

A

`( h sin (phi-theta))/(sin (phi+theta))`

B

`(h sin (phi + theta))/(sin (phi - theta))`

C

`(h sin (theta+phi))/(sin ( theta-phi))`

D

none of these

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The correct Answer is:
B
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OBJECTIVE RD SHARMA-HEIGHTS AND DISTANCES-Exercise
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  3. The angle of elevation of a cloud from a point h mt. above is theta^@ ...

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  4. On the level ground, the angle of elevation of a tower is 30^(@). O...

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  5. Each side of a square substends an angle of 60^@ at the top of a towe...

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  6. The angle of elevation of the top of a tower at any point on the groun...

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  7. Form the top of a light house 60 m high with its base at the sea-level...

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  8. A person standing on the bank of a river observes that the angle subte...

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  9. AB is a vertical pole. The end A is on the level ground .C is the midd...

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  10. A tree is broken by wind, its upper part touches the ground at a point...

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  11. An aeroplane flying at a height 300 metre above the ground passes vert...

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  12. A tower subtends an angle alpha at a point in the plane of its base a...

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  13. The angle of elevation of the top of a tower standing on a horizontal ...

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  14. From an aeroplane vertically over a straight horizontal road, the angl...

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  15. A vertical tower stands on a declicity which is inclined at 15^@ to th...

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  16. The angle of elevation of an object on a hill from a point on the grou...

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  17. A tower of x metres height has flag staff at its top. The tower and th...

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  18. .A house of height 100 m substends a right angle at the window of an o...

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  19. A tower of height b substends an angle at a point O on the leavel of t...

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  20. A man of height 6 ft. observes the top of a tower and the foot of th...

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