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A thin prism,\mathrm{P_{1}} with an angle 6^{0} and made of glass of refractive index 1.54 is combined with another prism \mathrm{P}_{2} made from glass of refractive index 1.72 to produce dispersion without average deviation. The angle of prism\mathrm{P}_{2} is  

Option: 1

1.3^{\circ}


Option: 2

6^{\circ}


Option: 3

4.5^{\circ}


Option: 4

7.8^{\circ}


Answers (1)

\delta_{1}=\delta_{2}  [For no deviation]

6(1.54-1)=\mathrm{A}(1.72-1)
\mathrm{A}=\frac{18}{4}=4.5^{\circ}
 

Posted by

Ramraj Saini

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