Question

The light of which colour has the least velocity in the glass prism?
a)red
b)blue
c)green
d) violent ​

Answer 1

Answer:

d) violet because it has the least wavelength

Explanation:

speed= frequency*wavelength

frequency remains unchanged while travelling through different media so one with the least Wavelength is the slowest

Answer 2

Answer :-

$\large{\bf{ \purple{d) \: Violet}}}$

Explanation :-

We know that;

$\boxed{ \sf {Wavelength \propto \: Velocity}}$

• As the wavelength increases the velocity also increases.
• As the wavelength decreases, the velocity of the light also decreases

$\sf{ \red{Red} \: colour \: has \: the \: least \: wavelength.}$

So, it has travels through least velocity.

The order of velocity of different colours of light are as follows:

Violet < Blue < Green < Red

Know more:

1. Splitting up of white light into its 7 constituent colours is known as dispersion.
2. This phenomenon can be clearly observed in prism and also in formation of rainbow.