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Q.

Two prisms A and B in contact with each other. The dispersive power of A and B is 0.04 and 0.03 respectively. The angular dispersion produced by ‘A’ is 80 . The angular dispersion produced by the combination, if the combination does not produce a net deviation is

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a

140

b

80

c

60

d

20

answer is D.

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Detailed Solution

μ1-1A1+μ2-1A2=0 Angle of dispersion is μv-μRA=ωμ-1A so total dispersion  ω1μ1-1A1-ω2μ2-1A2 ω1μ1-1A11-ω2ω1=81-0.030.04=20
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