Questions on Light
Q1. It is night-time and the desk lamp is on. Light shines onto the key.
![](Lightgraphic1ANS.png)
(a)
(i) Draw one ray of light on the diagram to show the light shining from the lamp onto the key. Use a ruler. Put an arrow on the ray to show the direction of the light.
A continuous straight line from the rim of the lamp 1 to the key the line must reach the key ![](../../../graphics/symbols/nuclides/ticksmall.png)
Arrow on the line pointing away from the lamp ![](../../../graphics/symbols/nuclides/ticksmall.png)
2 marks
(ii) There is a patch of light on the wall. This light has been reflected from the key. Draw a reflected ray of light on the diagram. Use a ruler.
A straight line from the key to the patch of light - the line must both touch the key and reach the patch of light ![](../../../graphics/symbols/nuclides/ticksmall.png)
Arrow on the line pointing towards the patch of light ![](../../../graphics/symbols/nuclides/ticksmall.png)
2 marks
(b) There is a dark shadow on the table beside the mug. Explain how this shadow is formed.
The mug is opaque - light cannot go through the mug
. The mug absorbs or scatters the light. Light cannot bend around the mug because light travels in straight lines
.There is therefore a patch where the light does not shine - this is the shadow
.
2 marks max
Maximum 6 marks