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| Numerical - 31 |
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| 31. A glass plate (m= 1.5) is used as a polarizer. Obtain the polarizing angle of incidence. What is the angle of refraction when the reflected light is plane polarized? |
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| Suggested solution: |
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| According to Brewster's law, the polarizing angle of incidence ip is |
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| m = tan ip or 1.5 = tan ip |
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| .. ip = tan-1(1.5) = 56.30 |
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| When light is incident at the polarizing angle of incidence, the reflected beam is perpendicular to the transmitted beam. If r is angle of refraction, ip + r = 900 r = 90 56.3 = 33.70 |
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