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?

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.

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.

Draw a labeled ray diagram to show how a ray of light passes through a parallel sided glass block

(a) If it hits the glass block at 90° (that is, perpendicular to the glass block)

(b) If it hits the glass block at an angle other than 90° (that is, obliquely to the glass block).

When a light ray passes from air into glass, what happens to its speed? Draw a diagram to show which way the ray of light bends.