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A surveyor on one bank of canal observed...

A surveyor on one bank of canal observed the image of the 4 inch and 17 ft marks on a vertical staff,which is partially immersed in the water and held against the bank directly opposite to him, coincides If the `17 ft` mark and the surveyor's eye are both `6 ft` above the water level ,estimate the width of the canal ,assuming that the reflective index of the water is `4//3` .Zero mark is at the bottom of the canal.

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16 Feet
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