Question

The coloured light having the maximum speed in glass prism is :

• A. Yellow
• B. Orange
• C. Violet
• D. Blue

Answer 1

The correct option is B Orange

$Answer:-$ B option

$\mu =\frac{c}{v}\mu \propto \frac{1}{v}$

$\mu$ order :- violet>Indigo>blue>green>yellow>orange>red

Since among given four colours orange has minimum $\mu$, so its speed will be maximum since $\mu$ and $v$ have inverse relation.