Question

true or false - if N glass = 3/2 N h2O= 4/3 then speed of light in glass is 2 *108 speed in water is 2.25 *108 metre​

Answer 1

Answer:

Given :    n  

water

​  

=  

3

4

​  

           n  

glass

​  

=  

2

3

​  

             v  

glass

​  

=2×10  

8

  m/s            n  

air

​  

=1

Speed of light in a medium        v  

medium

​  

=  

n

c

​  

         

where  c and n are the speed of light in vacuum and refractive index of medium respectively.

(a) :     v  

glass

​  

=  

n  

glass

​  

 

c

​  

 

∴     2×10  

8

=  

(3/2)

c

​  

                        ⟹c=3×10  

8

  m/s

(b) :     v  

water

​  

=  

n  

water

​  

 

c

​  

 

∴     v  

water

​  

=  

(4/3)

3×10  

8

 

​  

=2.26×10  

8

  m/s  

Explanation: please make me on brain list.