Questions on Light
Q13. The diagram shows two rays of light coming from a point source, reflecting in a plane mirror, and entering a person's eye. The person sees an image of the light source at a point behind the mirror.
(a) On the diagram, draw construction lines to find the position where the image appears. Label the image I.
Either the dashed construction lines - - - - tracing the rays back to a virtual image point or the dotted lines ....... must be drawn
1 mark
(b)
(i) The person moves further away from the mirror. How does this affect the position of the image relative to the mirror?
The image is in the same place relative to the mirror
1 mark
(ii) The point source of light is moved closer to the mirror. How does this affect the position of the image?
It is closer to the mirror
1 mark
The diagram below shows two rays of light coming from a small fish in some water. The rays enter a person's eye.
(c) The person sees an image of the fish under the water. On the diagram, draw construction lines to find the position of the image. Label the image I.
See diagram
1 mark
(d) In some parts of the world, people catch fish using spears. When they see the image of a fish in the water, where should they aim?
Below the apparent position of the fish
1 mark
Maximum 5 marks