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Q.

A thin prism P1 with angle 6 ° and made from glass of refractive index 1.54 is combined with another thin prism P2 of refractive index 1.72  to produce dispersion without deviation. The angle of prism P2 will be 

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a

5∘24'

b

4∘30'

c

6∘

d

8∘

answer is B.

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Detailed Solution

To produce dispersion without deviation,

A'A=μy-1μy'-1 ⇒A'6=-1.54-11.72-1 ⇒A'=-4.5∘          =-4∘30'

 

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A thin prism P1 with angle 6 ° and made from glass of refractive index 1.54 is combined with another thin prism P2 of refractive index 1.72  to produce dispersion without deviation. The angle of prism P2 will be