Ankon kept a
plane mirror inclined at an angle of $10^\circ$ with horizontal inside a water
filled container. A ray of light with a wavelength of $550$ nm from air is
incident on the water's surface. The refractive index of water is $1.33$. What
is the maximum value of the incident angle for which the light ray will be able
to emerge from the water's surface after reflecting off the mirror?