Question

Read the Passage carefully and Answer the Questions from P7 to P10 The absolute refractive indices of A,B&C are 1.5,2 and 2.5 respectively. Based on this data answer the following four questions


Speed of light in medium B *

1 point

3x10^8 m/s

1.5x10^8 cm/s

3x10^8 cm/s

1.5x10^8 m/s

​

Answer 1

Answer:

$\huge\mathfrak\pink hii$

$\huge\mathfrak\green(Goodmorning)$

Explanation:

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