Question

In a thin prism of glass (refractive index 1.5$)$, which of the following relations between the angle of minimum deviations $\delta_{m}$ and angle of refraction $r$ will be correct?

• A. $\delta_{m}=r$
• B. $\delta_{m}=1.5\, r$
• C. $\delta_{m}=2 r$
• D. $\delta_{m}=\frac{r}{2}$

Answer 1

Answer: (A)

$\delta_{m}=(\mu-1) A,$ At $\delta_{m^{\prime}} i=e$ and $r_{1}=r_{2}=r$
$\Rightarrow A=r_{1}+r_{2}=2 r$
$\delta_{m}=(1.5-1)(2 r)=r$