The diagram given alongside shows a ray of light entering a rectangular block of glass.

(a) Copy the diagram and draw the normal at the point of entry.

(b) Draw the approximate path of the ray of light through the glass block and out of the other side.

A ray of light travelling in air is incident on a rectangular glass block and emerges out into the air from the opposite face. Draw a labeled ray diagram to show the complete path of this ray of light. Mark the two points where the refraction of light takes place. What can you say about the final direction of ray of light?

Draw a labeled ray diagram to show how a ray of light is refracted when it passes:

(a) From air into an optically denser medium.

(b) From an optically denser medium into air.

What is meant by the 'angle of incidence' and the 'angle of refraction' for a ray of light? Draw a labeled ray diagram to show the angle of incidence and the angle of refraction for a refracted ray of light.

Light travels more quickly through water than through glass.

(a) Which is optically denser: water or glass?

(b) If a ray of light passes from glass into water, which way will it bend: towards the normal or away from the normal?