Question

The refracting angle of the prism is ${4.5}^{\circ }$ and its refractive index is $1.52$. The angle of minimum deviation will be :

• A. $2^{\circ }$
• B. ${2.3}^{\circ }$
• C. ${4.5}^{\circ }$
• D. ${1.5}^{\circ }$

Answer 1

The correct option is B ${2.3}^{\circ }$

Given,

$A={4.5}^{\circ }$

$\mu =1.52$

The minimum deviation is given by :

${\delta }_{min}=(\mu -1)\times A$

=> ${\delta }_{min}=(1.52-1)\times 4.5={2.34}^{\circ }$.