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Question

A glass prism deviates the red and blue rays through 10 and 12 respectively. A second prism of equal angle deviates them through 8 and 10 respectively. Their dispersive powers are in the ratio

A
11: 9
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B
9 :11
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C
3 : 2
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D
1 : 1
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Solution

The correct option is B 9 :11
w=DvDrD;D=Dv+Dr2D1=12+102W1W2=[DvDrD]1[DvDrD]2=11D2=10+82=(121011)(1089)=9=2×911×2W1=W29:11

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