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When the length of the shadow of a pole is equal to the height of the pole, then the elevation of source of light is :
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- 30°
- 45°
- 60°
- 75°
Correct Option: B
As per given figure , we have
Let the height of the pole = h , The length of the shadow of a pole = x
Given :- The length of the shadow of a pole is equal to the height of the pole i.e. h = x
| Since | h | = | tanθ |
| x |
| ⇒ | x | = | tanθ |
| x |
∴ tanθ = 1 = tan45° ⇒ θ = 45° .
