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A crown glass prism of refracting angle 8° is combined with a flint glass prism to obtain deviation without dispersion. If the refractive indices for red and violet rays for crown glass are 1.514 and 1.524 and for the flint glass are 1.645 and 1.665 respectively, find the angles flint glass prism and net deviation. |
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Answer» Solution :The condition for deviation with out dispersion is ` ( mu_A - mu_R) A= (mu_V - MU _R )A` ` thereforeA.= ( ( 1.524-1.514)xx 8^0)/( (1.665- 1.645 )) =( 0.08^0)/(0.02 )= 4^0` Mean REFRACTIVE INDEX for crown glass `mu= ( 1.514 + 1.524)/( 2) = 1.519` Mean refractive index for flint glass `mu+ (1.645 + 1.665 ) /( 2)= 1.655` ` therefore ` The netdeviation`( DELTA - delta .) = ( mu-1) A - ( mu.-1) A.` `=0.159 xx 8^0 - 0.655xx 4^0` ` = 1.53^@` |
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