Answer:
Refractive index = 2
Explanation:
By the law of refraction [tex]n = \frac{c}{v}[/tex]:
where n is the refractive index
c is the speed of light
v is the speed of light in a certain material
We know that the speed of light c is 3*10^8 m/s
[tex]n = \frac{3e8}{3e8*0.5} = 2[/tex]
