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標題:

都都都都係一條物理

發問:

http://xs.to/image-7013_4BA8EDB5.jpg

最佳解答:

(a) Use Snell's law, sin(60)/sin(w) = 1.5 hence, w = arc-sin[sin(60)/1.5] = 35.26 degrees angle X = (90 - 35.26) degrees = 54.74 degrees By Law of reflection, angle Y = angle X = 54.74 degrees Let the angle of incident at surface CD be i, then angle i = (90- 54.74) degrees = 35.26 degrees Applying Snell's Law at the surface CD, sin(35.26)/sin(z) = 1/1.5 i.e. sin(z) = (1.5)sin(35.26) z = arc-sin[(1.5)sin(35.26)] = 60 degrees (b) The two angles are equal.

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