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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 refractive index of the water is 4 / 3 .

Correct answer

16

Step-by-step solution

= 4 3 aligned & d 36+ d ^2 = 4 3 x 3 ~d 1024+9 ~d ^2 & ~d =8 ft , widthof canal =16 ft aligned

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