Fig. 6.1 shows an empty container together with an observer’s eye. A small coin is located at position O, but the observer cannot see it. The coin and the observer remain fixed while the container is then filled with water. After the water is added, the observer can see the coin.
(a(i))[2]
Explain why the observer is able to see the coin.
(a(ii))[1]
State the name of the wave process that occurs as the light passes from water into air.
(a(iii))[1]
Explain why the image of the coin is a virtual image.
(b)[1]
State the speed of light in air.
(c)[3]
Calculate the speed of light in water.
Worked solution & mark scheme
This 8-mark question has a full step-by-step worked solution and mark scheme. One marking point: “The light is bent / refracted at the boundary” …