Question

refrective indices of four medium are as follows p1.3 q1.5 r2.42 s1.65 in which medium speed of light is minimum​

Answer 1

ANSWER:

speed of light is minimum in medium R with refractive index 2.42

FORMULA:

refractive index of the medium,

$\boxed{\mu=\frac{c}{v}}$

where,

• c is the velocity of light in air or vacuum.

• v is the velocity of light in any medium

SOLUTION:

• from the above formula, it is clear that , REFRACTIVE INDEX OF THE MEDIUM IS INVERSELY PROPORTIONAL TO THE VELOCITY OF LIGHT IN THAT MEDIUM.

• if the refractive index is more, then the velocity of light in that medium will be less.

• if the refractive index is less, then the velocity of light in that medium will be more.

• from the given options, medium R has more value of refractive index of 2.42

• so the light travels slowly in the medium R.

INCREASING ORDER OF VALUE OF REFRACTIVE INDEX:

1.3 < 1.5 < 1.65 < 2.42

medium : P < Q < S < R

DECREASING ORDER OF SPEED OF LIGHT IN THE MEDIUM:

P > Q > S > R

FACTS RELATED TO QUESTION:

• the velocity of light in air or vaccum is constant.

• its value is ${c= 3×10^8m/s}$

• according to snell's law ,

$\qquad\mu=\frac{sin i}{sinr}$

where,

• sin i is the angle of incidence
• sin r is the angle of refraction