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Q.

Three prisms of crown glass, each have angle of prism 9° and two prisms of flint glass are used to make direct vision spectroscope. What will be the angle of flint glass prisms if μ for flint is 1.60 and μ for crown glass is 1.53

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An Intiative by Sri Chaitanya

a

11.9°

b

16.0°

c

15.3°

d

9.11°

answer is A.

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Detailed Solution

Total deviation = 0δ1+δ2+δ3+δ4+δ5=μ1−1A1−μ2−1A2+μ3−1A3−μ4−1A4+μ5−1A5=0⇒2×A2(1.6−1)=3(1.53−1)9 ⇒A2=30.53×91.2=11.9∘

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