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Three prisms of crown glass, each have angle of prism 9° and two prisms of flint glass are used to make direct vision spectroscope. What will be the angle of flint glass prisms if  for flint is 1.60 and  for crown glass is 1.53

1. 11.9°
2. 16.0°
3. 15.3°
4. 9.11°

Correct answer: 11.9°

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