The 80-cm-tall, 65-cm-wide tank shown in the figure is completely filled with wa

Question

The 80-cm-tall, 65-cm-wide tank shown in the figure is completely filled with water The tank has marks every 10 cm along one wall, and the 0 cm mark is barely submerged. As you stand beside the opposite wall, your eye is level with the top of the water. Part A Can you see the marks from the top of the tank (the 0 cm mark) going down, or from the bottom of the tank (the 80 cm mark) coming up? We can see the marks from the top of the tank going down. We can see the marks from the bottom of the tank coming up. Part B Which is the lowest or highest mark, depending on your answer to part a, that you can see? Express your answer to two significant figures and include the appropriate units. d = _______

Explanation / Answer

part A)

we can see the marks from the bottom of the tank coming up

Part B)

for total internal reflection

nwater Sin C = nair sin90

1.33 SinC = 1

C = 48.7

let the lowest mark be at distance "x" from the top

w = width of the base = 65 cm

using trigonomteric ration

tanC = width/depth = 65/x

tan48.7 = 65/x

x = 57 cm

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