Question

A ray of light passes through a prism whose refracting angle is `5^(@)` and dispersive power is 0.03. The refractive index for the mean ray in a spectrum is 1.62. The mean deviation and angle of dispersion respectively are
A. `3.1^(@),0.077^(@)`
B. `3.1^(@),0.093^(@)`
C. `6.2^(@),0.093^(@)`
D. `6.2^(@),0.077^(@)`

Answer 1

Correct Answer - B
`delta_(4)(mu_(4)-1)A=(1.62-1)xx5^(@)`
`=0.62xx5=3.1^(@)`
`theta=delta_(b)-delta_(R)=omegaxxdelta0.03" "5(1.62-1)xx5`
`=0.093^(@)`