Question

please tell fast please tell​

Answer 1

$answer$

Speed of light ,v=c/ μ

where c=speed of light in vacuum

and μ = refractive index of medium

Hence, for maximum speed, μ should be minimum.

The speed of light is inversely proportional to optical density.

μR >μP>μQ

The speed of light is inversely proportional to optical density.

So R>P>Q.

Q,P,R is the increasing order.

Option C.

Answer 2

Answer:

$qpr \: is \: correct \: answer \\ option \: c \: is \: correct$