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31. A beam of light is incident upon a flat piece of glass (n = 1.50)...

31. A beam of light is incident upon a flat piece of glass (n = 1.50) at an angle of incidence of 37.2°. Part of the beam is transmitted and part is reflected. What is the angle between the reflected and transmitted rays? answer 119° 29. A light ray passes from air through a thin plastic slab (n = 1.77) with parallel sides. If the ray in air makes an angle of 49° with the normal after leaving the slab, what is the angle of incidence for the ray in air as it impinges upon the other side of the slab? answer 49°

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