What is the maximum angle with which a light ray can be incident on the glass$/$air interface and still refract? The index of refraction of the glass is $1\mathrm{.}4\mathrm{.}45\mathrm{.}6\backslash$deg $61\mathrm{.}3\backslash$deg $32\mathrm{.}6\backslash$deg $17\mathrm{.}8\backslash$deg