Published by:
CGP EDU Academic Team
Published on: September 12, 2026
A pole is vertically submerged in swimming pool, such that it gives a length of shadow 2.15m within water when sunlight is incident at an angle of 30 ° with the surface of water. If swimming pool is filled to a height of 1.5 m, then the height of the pole above the water surface in centimeters is 
_____.
Text Solution
Verified by ExpertsThe correct answer is:
50
(50)
Let angle BAC is 
.
Applying Snell's law at £", we get 1 x sin60° = 
x sin 
Now, BC=1.5xtan 
=1.28
Then, AB = 2.15 - BC = 0. 86 m
Required value, DF = AB tan 30° = 0. 5015 m 
50 cm
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