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The respective angles of the flint and crown glass prisms are A ’ and A . They are to be used for dispersion without deviation, then the ratio of their angles A ' / A will be

1. ) 1 ' ( ) 1 (    y y  
2. ) 1 ( ) 1 ' (   y y  
3. ) 1 ' (  y 
4. ) 1 (  y 

Correct answer: ) 1 ' ( ) 1 (    y y  

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