Question

The speed of light in crown glass is 1.97 x 108 m/s. Calculate the refractive index of crown

glass if speed of light in vacuum is 3 x 108 m/s.​

Answer 1

Answer:

(a) nflint=speed of light in flint glassspeed of light in vacuum=1.86×1083×108=1.61 

ncrown=speed of light in crown glassspeed of light in vacuum=1.97×1083×18=1.52 

(b) crownnflint=speed of light in flint glassspeed of light in crown glass =1.86×1081.97×108=1.059  

Answer 2

(a) n

flint

=

speed of light in flint glass

speed of light in vacuum

=

1.86×10

8

3×10

8

=1.61

n

crown

=

speed of light in crown glass

speed of light in vacuum

=

1.97×10

8

3×1

8

=1.52

(b)

crown

n

flint

=

speed of light in flint glass

speed of light in crown glass

=

1.86×10

8

1.97×10

8

=1.059