Question

Refractive indices of flint glass prism for c, d and f lines are 1.790, 1.795 and 1.805 respectively. the dispersive power of the prism

Answer 1

Given that,

Refractive indices of flint glass prism for

$c=1.790$

$d=1.795$

$f=1.805$

We need to calculate the dispersive power of the prism

Using formula of dispersive power

$\text{dispersive power}=\dfrac{u_{f}-u_{c}}{u_{d}-1}$

Put the value into the formula

$\text{dispersive power}=\dfrac{1.805-1.790}{1.795-1}$

$\text{dispersive power}=0.0188$

Hence, The dispersive power of the prism is 0.0188.