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A glass prism deviates the red and blue rays through 10⁰ and 12⁰ respectively. A second prism of equal angle deviates them through 8⁰ and 10⁰ respectively. Their dispersive powers are in the ratio

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11 : 9

9 : 11

3 : 2

1 : 1

answer is B.

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Detailed Solution

$\frac{ω_{1}}{ω_{2}} = \frac{\frac{(d_{B_{1}} - d_{R_{1}})}{(\frac{d_{B_{1}} + d_{R_{1}}}{2})}}{\frac{(d_{B_{2}} - d_{R_{2}})}{(\frac{d_{B_{2}} + d_{R_{2}}}{2})}} = 9 / 11$

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