Answers

2016-03-01T12:55:01+05:30
Since the refractive index of glass = speed of light in air / speed of light in glass . 
                 C= v/n
               4/3= v/ 2 x 10' 8
         v= 4/3 x 2 x 10' 8                 
           = 8/3 x 10' 8 
           = 2.6 x 10' 8
                        by rounding off the 2.6 x 10' 8 we get 3 x 10' 8
  
                REFRACTIVE INDEX OF WATER = speed of light in air / speed of light in water .
                                         n = u/w
                            w = v/n 
                                  = 3 x 10' 8 / 3/2  ..... [ here 3/2 is from the question]
                  
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2016-03-01T15:47:58+05:30
The refractive index of water with respect to air = 4/3 

The refractive index of glass with respect to air = 3/2 

(1) Refractive index (of a medium) 

= speed of light in air / speed of light in medium 

3/2 = speed of light in air / 2 x 108 ms-1 

: Speed of light in air = 3x10 -8 ms-1 

(2) 4/3 = speed of light in air / speed of light in water 

or  4/3 = 3 X 10 8 m/s / speed of light in water 

or speed of light in water = 9/4 X10 8 

= 2.25 X 10 8 ms-1.
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