In visible region the dispersive powers and the mean angular deviation for crown and flint glass prism are omega,omega. and d, d. respectively. The condition for getting deviation without dispersion when the two prism are combined is

In visible region the dispersive powers and the mean angular deviation

1.	In visible region the dispersive powers and the mean angular deviation for crown and flint glass prism are omega,omega. and d, d. respectively. The condition for getting deviation without dispersion when the two prism are combined is
Answer» `SQRT(omegad)+sqrt(omega^1d^1)=0` `omega^1 d+omegad^1=0` `omegad+omega^1d^1=0` `(omega d)^2 +(omega^1 d^1)^2=0` ANSWER :C