A ray of light strikes the surface of a rectangular glass block such that the angle of incidence in air is given as $45°$. Draw a diagram to show the path chosen by the ray as it passes through the rectangular glass block and emerges from it.

 

A ray of monochromatic green light enters a liquid from air, as shown in the given figure below. The angle $1$ is $45°$ and angle $2$ is $30°$. Find the refractive index of liquid.

A ray of monochromatic green light enters a liquid from air, as shown in the given figure below. The angle $1$ is $45°$ and angle $2$ is $30°$°. Show in the diagram the path of the ray after it strikes the mirror and re-enters in air. Mark in the diagram the angles where ever necessary.

A ray of monochromatic green light enters a liquid from air, as shown in the given figure below. The angle $1$ is $45°$ and angle $2$ is$30°$. Redraw the diagram if plane mirror becomes normal to the refracted ray inside the liquid. State the principle used. 

When a lighted candle is held in front of a thick plane glass mirror, various images can be seen, but the second image formed is the brightest, give reason.