Question

One bright summer day a swimmer is floating with her head just above the surface of a large, clear lake where the water has index of refraction n = 1.43. She comes upon a tall wooden post emerging from the water. When she looks into the water at just the right angle she can see the bottom of the post, which is at a depth h = 5.50 m below the water's surface. As she floats away from the post, eventually she can no longer see the bottom of it. At what distance d from the post does this occur? (in m)

Answer 1

5.38035 m

Step-by-step explanation:

`n_w` = Refactive index of water = 1.43

h = Depth = 5.5 m

Critical angle is given by

`\theta_c=sin^(-1)(1)/(n_w)\\\Rightarrow \theta_c=sin^(-1)(1)/(1.43)\\\Rightarrow \theta_c=44.37^(\circ)`

d = horizontal distance from the post where she no longer see the bottom of wooden post

So,

`tan\theta_c=(d)/(h)\\\Rightarrow d=tan\theta_c* h\\\Rightarrow d=tan44.37* 5.5\\\Rightarrow d=5.38035\ m`

The distance d is 5.38035 m