A research vessel has a round glass window in bottom for observing the seabed. The diameter of the glass window is 60 cm, the thickness of the glass is 20 mm and the index of refraction of water is 1.33 and that of the glass is 1.55. The seabed is 6.0 m beneath the window. A man in interior of vessel can see seabed through window.
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(c, d)
Snell law
1.33 sin θ = 1 × sin 90 0 sin θ = 
= 
x = 6 tan θ
x = 6 × 
= 6.8
Radius of viewable area = π [6.8 + 0.3]
2
= 160m 2 approx
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