p34_050

# p34_050 - 50. (a) An incident ray which is normal to the...

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50. (a) An incident ray which is normal to the water surface is not refracted, so the angle at which it strikes the Frst mirror is θ 1 =45 . According to the law of reﬂection, the angle of reﬂection is also 45 . This means the ray is horizontal as it leaves the Frst mirror, and the angle of incidence at the second mirror is θ 2 =45 . Since the angle of reﬂection at the second mirror is also 45 the ray leaves that mirror normal again to the water surface. There is no refraction at the water surface, and the emerging ray is parallel to the incident ray. (b) We imagine that the incident ray makes an angle θ 1 with the normal to the water surface. The angle of refraction θ 2 is found from sin θ 1 = n sin θ 2 ,wh e r e n is the index of refraction of the water. The normal to the water surface and the normal to the Frst mirror make an angle of 45
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## This note was uploaded on 11/12/2011 for the course PHYS 2001 taught by Professor Sprunger during the Fall '08 term at LSU.

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