Answer:
1.2
Explanation:
First find the frequency of UV light as follows:
[tex]f=\frac{c}{\lambda}\\f=\frac{3\times10^8}{300\times10^{-9}}=10^{15}Hz[/tex]
The frequency does not change when light enters from vacuum into glass.
[tex]v=f\lambda\\v=10^{15}\times 250\times10^{-9}=2.50\times10^8m/s[/tex]
Refractive index of glass can be calculated as follows:
[tex]\mu=\frac{c}{v}[/tex]
where, v is the velocity of UV light in glass.
[tex]\mu=\frac{3\times10^8}{2.5\times10^8}=1.2[/tex]
