1. ## physics optics question

An equilateral triangular glass prism has an index of refraction of 1.52. Calculate the angle of incidence at which a ray of light would traverse the prism symmetrically (the angle of emergence equal to the angle of incidence).

$n_1\sin\theta_1=n_2\sin\theta_2$
$1\cdot\sin\theta_1=1.52\sin{30^{\circ}}$
$\sin\theta_1=1.52\cdot\frac{1}{2}$
$\sin\theta_1=0.76$