How do you calculate the refractive index using calculator?

To calculate the refractive index (n) using a calculator, you can use the formula ( n = \frac{c}{v} ), where ( c ) is the speed of light in a vacuum (approximately ( 3.00 \times 10^8 ) m/s) and ( v ) is the speed of light in the medium. Simply divide the speed of light in a vacuum by the speed of light in the medium to obtain the refractive index. If you have the angle of incidence and the angle of refraction, you can also use Snell's law: ( n_1 \sin(\theta_1) = n_2 \sin(\theta_2) ) to find the refractive index of the second medium.