1.

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Answer:

EXPLANATION:

REFRACTIVE index of WATER   n  

w

​  

=  

3

4

​  

 

Refractive index of GAS  n  

g

​  

=  

2

3

​  

 

Refractive index of GLASS w.r.t. water   n  

gw

​  

=  

n  

w

​  

 

n  

g

​  

 

​  

 

⟹ n  

gw

​  

=  

4/3

3/2

​  

=  

8

9



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