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Q.

A deviation of 20 is produced in the yellow ray when prism of crown and flint glass are achromatically combined. Taking dispersive powers of crown and flint glass as 0.02 and 0.03 respectively and refractive index for yellow light for these glasses are 1.5 and 1.6 respectively. The refracting angles for crown glass prism will be_____ ° (in degree) (Round off to the Nearest Integer)

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answer is 12.

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Detailed Solution

Using,

δnet=δ11−ω1ω2

2=δ11−0.020.03=δ113⇒δ1=6

Also, δ1=Aμ1−1=A(1.5−1)⇒A=12∘

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