Question

a ray of light travelling in the direction of E. O in air enters the rectangular block at an angle of incidence of 30° the resulting angle of refraction=18° (a)find the refractive index n of the block​

Answer 1

Hola mate here is your answer!

Solution:

$\frac{sin \: i}{sin \: r} = refractive \: index$

$\frac{ \frac{1}{2} }{ - 0.75} = mu$

refractive index=-0.66